diff --git a/NEWS.md b/NEWS.md
index 7c29e73e..2e1372e2 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -53,24 +53,102 @@
 
 * There are two changes to `allow_value`:
 
-  * The negative form of the matcher has been changed so that instead of
+  * The negative form of `allow_value` has been changed so that instead of
     asserting that any of the given values is an invalid value (allowing good
     values to pass through), assert that *all* values are invalid values
     (allowing good values not to pass through). This means that this test which
     formerly passed will now fail:
 
-        expect(record).not_to allow_value('good value', *bad_values)
+    ``` ruby
+    expect(record).not_to allow_value('good value', *bad_values)
+    ```
 
     ([19ce8a6])
 
-  * The matcher may raise an error if the attribute in question contains
-    custom logic to ignore certain values, resulting in a discrepancy between
-    the value you provide and the value that the attribute is actually set to.
-    Specifically, if the attribute cannot be changed from a non-nil value to a
-    nil value, or vice versa, then you'll get a CouldNotSetAttributeError. The
-    current behavior (which is to permit this) is misleading, as the test that
-    you're writing under the hood by using `allow_value` could be different from
-    the test that actually ends up getting run. ([eaaa2d8])
+  * `allow_value` now raises a CouldNotSetAttributeError if in setting the
+    attribute, the value of the attribute from reading the attribute back is
+    different from the one used to set it.
+
+    This would happen if the writer method for that attribute has custom logic
+    to ignore certain incoming values or change them in any way. Here are three
+    examples we've seen:
+
+    * You're attempting to assert that an attribute should not allow nil, yet
+      the attribute's writer method contains a conditional to do nothing if
+      the attribute is set to nil:
+
+      ``` ruby
+      class Foo
+        include ActiveModel::Model
+
+        attr_reader :bar
+
+        def bar=(value)
+          return if value.nil?
+          @bar = value
+        end
+      end
+
+      describe Foo do
+        it do
+          foo = Foo.new
+          foo.bar = "baz"
+          # This will raise a CouldNotSetAttributeError since `foo.bar` is now "123"
+          expect(foo).not_to allow_value(nil).for(:bar)
+        end
+      end
+      ```
+
+    * You're attempting to assert that an numeric attribute should not allow a
+      string that contains non-numeric characters, yet the writer method for
+      that attribute strips out non-numeric characters:
+
+      ``` ruby
+      class Foo
+        include ActiveModel::Model
+
+        attr_reader :bar
+
+        def bar=(value)
+          @bar = value.gsub(/\D+/, '')
+        end
+      end
+
+      describe Foo do
+        it do
+          foo = Foo.new
+          # This will raise a CouldNotSetAttributeError since `foo.bar` is now "123"
+          expect(foo).not_to allow_value("abc123").for(:bar)
+        end
+      end
+      ```
+
+    * You're passing a value to `allow_value` that the model typecasts into
+      another value:
+
+      ``` ruby
+      describe Foo do
+        # Assume that `attr` is a string
+        # This will raise a CouldNotSetAttributeError since `attr` typecasts `[]` to `"[]"`
+        it { should_not allow_value([]).for(:attr) }
+      end
+      ```
+
+    With all of these failing examples, why are we making this change? We want
+    to guard you (as the developer) from writing a test that you think acts one
+    way but actually acts a different way, as this could lead to a confusing
+    false positive or negative.
+
+    If you understand the problem and wish to override this behavior so that
+    you do not get a CouldNotSetAttributeError, you can add the
+    `ignoring_interference_by_writer` qualifier like so. Note that this will not
+    always cause the test to pass.
+
+    ``` ruby
+    it { should_not allow_value([]).for(:attr).ignoring_interference_by_writer }
+    ```
+
+    ([eaaa2d8])
 
 * `validate_uniqueness_of` is now properly case-insensitive by default, to match
   the default behavior of the validation itself. This is a backward-incompatible
diff --git a/lib/shoulda/matchers/active_model/allow_value_matcher.rb b/lib/shoulda/matchers/active_model/allow_value_matcher.rb
index 57b8a9b0..88e1f3f7 100644
--- a/lib/shoulda/matchers/active_model/allow_value_matcher.rb
+++ b/lib/shoulda/matchers/active_model/allow_value_matcher.rb
@@ -226,6 +226,7 @@ module Shoulda
           self.options = {}
           self.after_setting_value_callback = -> {}
           self.validator = Validator.new
+          @ignoring_interference_by_writer = false
         end
 
         def for(attribute)
@@ -255,6 +256,11 @@ module Shoulda
           self
         end
 
+        def ignoring_interference_by_writer
+          @ignoring_interference_by_writer = true
+          self
+        end
+
         def _after_setting_value(&callback)
           self.after_setting_value_callback = callback
         end
@@ -297,6 +303,10 @@ module Shoulda
           validator.attribute = attribute
         end
 
+        def ignoring_interference_by_writer?
+          @ignoring_interference_by_writer
+        end
+
         def value_matches?(value)
           self.value = value
           set_attribute(value)
@@ -305,14 +315,14 @@ module Shoulda
 
         def set_attribute(value)
           instance.__send__("#{attribute_to_set}=", value)
-          ensure_that_attribute_has_been_changed_to_or_from_nil!(value)
+          ensure_that_attribute_was_set!(value)
           after_setting_value_callback.call
         end
 
-        def ensure_that_attribute_has_been_changed_to_or_from_nil!(expected_value)
+        def ensure_that_attribute_was_set!(expected_value)
           actual_value = instance.__send__(attribute_to_set)
 
-          if expected_value.nil? != actual_value.nil?
+          if expected_value != actual_value && !ignoring_interference_by_writer?
             raise CouldNotSetAttributeError.create(
               instance.class,
               attribute_to_set,
diff --git a/lib/shoulda/matchers/active_model/disallow_value_matcher.rb b/lib/shoulda/matchers/active_model/disallow_value_matcher.rb
index 0cdcf4c2..9cf648a8 100644
--- a/lib/shoulda/matchers/active_model/disallow_value_matcher.rb
+++ b/lib/shoulda/matchers/active_model/disallow_value_matcher.rb
@@ -31,6 +31,11 @@ module Shoulda
           self
         end
 
+        def ignoring_interference_by_writer
+          @allow_matcher.ignoring_interference_by_writer
+          self
+        end
+
         def failure_message
           @allow_matcher.failure_message_when_negated
         end
diff --git a/lib/shoulda/matchers/active_model/numericality_matchers/comparison_matcher.rb b/lib/shoulda/matchers/active_model/numericality_matchers/comparison_matcher.rb
index 90d442f3..169aab9c 100644
--- a/lib/shoulda/matchers/active_model/numericality_matchers/comparison_matcher.rb
+++ b/lib/shoulda/matchers/active_model/numericality_matchers/comparison_matcher.rb
@@ -80,7 +80,11 @@ module Shoulda
           def submatchers
             @_submatchers ||=
               comparison_combos.map do |diff, submatcher_method_name|
-                matcher = __send__(submatcher_method_name, @value + diff, nil)
+                matcher = __send__(
+                  submatcher_method_name,
+                  (@value + diff).to_s,
+                  nil
+                )
                 matcher.with_message(@message, values: { count: @value })
                 matcher
               end
diff --git a/lib/shoulda/matchers/active_model/numericality_matchers/even_number_matcher.rb b/lib/shoulda/matchers/active_model/numericality_matchers/even_number_matcher.rb
index d744ce18..84db5c9b 100644
--- a/lib/shoulda/matchers/active_model/numericality_matchers/even_number_matcher.rb
+++ b/lib/shoulda/matchers/active_model/numericality_matchers/even_number_matcher.rb
@@ -8,9 +8,10 @@ module Shoulda
 
           def initialize(attribute, options = {})
             @attribute = attribute
-            @disallow_value_matcher = DisallowValueMatcher.new(NON_EVEN_NUMBER_VALUE).
-                for(@attribute).
-                with_message(:even)
+            @disallow_value_matcher =
+              DisallowValueMatcher.new(NON_EVEN_NUMBER_VALUE.to_s).
+              for(@attribute).
+              with_message(:even)
           end
 
           def allowed_type
diff --git a/lib/shoulda/matchers/active_model/numericality_matchers/odd_number_matcher.rb b/lib/shoulda/matchers/active_model/numericality_matchers/odd_number_matcher.rb
index c1538079..21ee7d88 100644
--- a/lib/shoulda/matchers/active_model/numericality_matchers/odd_number_matcher.rb
+++ b/lib/shoulda/matchers/active_model/numericality_matchers/odd_number_matcher.rb
@@ -8,9 +8,10 @@ module Shoulda
 
           def initialize(attribute, options = {})
             @attribute = attribute
-            @disallow_value_matcher = DisallowValueMatcher.new(NON_ODD_NUMBER_VALUE).
-                for(@attribute).
-                with_message(:odd)
+            @disallow_value_matcher =
+              DisallowValueMatcher.new(NON_ODD_NUMBER_VALUE.to_s).
+              for(@attribute).
+              with_message(:odd)
           end
 
           def allowed_type
diff --git a/lib/shoulda/matchers/active_model/numericality_matchers/only_integer_matcher.rb b/lib/shoulda/matchers/active_model/numericality_matchers/only_integer_matcher.rb
index 37004881..b699bdf1 100644
--- a/lib/shoulda/matchers/active_model/numericality_matchers/only_integer_matcher.rb
+++ b/lib/shoulda/matchers/active_model/numericality_matchers/only_integer_matcher.rb
@@ -7,7 +7,8 @@ module Shoulda
           NON_INTEGER_VALUE = 0.1
           def initialize(attribute)
             @attribute = attribute
-            @disallow_value_matcher = DisallowValueMatcher.new(NON_INTEGER_VALUE).
+            @disallow_value_matcher =
+              DisallowValueMatcher.new(NON_INTEGER_VALUE.to_s).
               for(attribute).
               with_message(:not_an_integer)
           end
diff --git a/lib/shoulda/matchers/active_model/validate_absence_of_matcher.rb b/lib/shoulda/matchers/active_model/validate_absence_of_matcher.rb
index c9cf2f37..cbd7dea0 100644
--- a/lib/shoulda/matchers/active_model/validate_absence_of_matcher.rb
+++ b/lib/shoulda/matchers/active_model/validate_absence_of_matcher.rb
@@ -86,6 +86,7 @@ module Shoulda
         def matches?(subject)
           super(subject)
           @expected_message ||= :present
+
           disallows_value_of(value, @expected_message)
         end
 
@@ -103,21 +104,22 @@ module Shoulda
             else
               obj
             end
-          elsif [Fixnum, Float].include?(attribute_class)
-            1
-          elsif attribute_class == BigDecimal
-            BigDecimal.new(1, 0)
-          elsif !attribute_class || attribute_class == String
-            'an arbitrary value'
           else
-            attribute_class.new
+            case column_type
+            when :integer, :float then 1
+            when :decimal then BigDecimal.new(1, 0)
+            when :datetime, :time, :timestamp then Time.now
+            when :date then Date.new
+            when :binary then "0"
+            else 'an arbitrary value'
+            end
           end
         end
 
-        def attribute_class
+        def column_type
           @subject.class.respond_to?(:columns_hash) &&
-            @subject.class.columns_hash[@attribute.to_s].respond_to?(:klass) &&
-            @subject.class.columns_hash[@attribute.to_s].klass
+            @subject.class.columns_hash[@attribute.to_s].respond_to?(:type) &&
+            @subject.class.columns_hash[@attribute.to_s].type
         end
 
         def collection?
diff --git a/lib/shoulda/matchers/error.rb b/lib/shoulda/matchers/error.rb
index 2ec38b14..e2b9f6b5 100644
--- a/lib/shoulda/matchers/error.rb
+++ b/lib/shoulda/matchers/error.rb
@@ -20,6 +20,10 @@ module Shoulda
       def message
         ""
       end
+
+      def inspect
+        %(#<#{self.class}: #{message}>)
+      end
     end
   end
 end
diff --git a/spec/unit/shoulda/matchers/active_model/allow_value_matcher_spec.rb b/spec/unit/shoulda/matchers/active_model/allow_value_matcher_spec.rb
index c6a742cd..b646b009 100644
--- a/spec/unit/shoulda/matchers/active_model/allow_value_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/active_model/allow_value_matcher_spec.rb
@@ -62,7 +62,9 @@ describe Shoulda::Matchers::ActiveModel::AllowValueMatcher, type: :model do
 
     it 'rejects several bad values' do
       expect(validating_format(with: /abc/)).
-        not_to allow_value('xyz', 'zyx', nil, []).for(:attr)
+        not_to allow_value('xyz', 'zyx', nil, []).
+        for(:attr).
+        ignoring_interference_by_writer
     end
   end
 
@@ -182,12 +184,18 @@ describe Shoulda::Matchers::ActiveModel::AllowValueMatcher, type: :model do
 
     it 'does not match given a bad value' do
       bad_values.each do |bad_value|
-        expect(model).not_to allow_value(bad_value).for(:attr)
+        expect(model).
+          not_to allow_value(bad_value).
+          for(:attr).
+          ignoring_interference_by_writer
       end
     end
 
     it 'does not match given multiple bad values' do
-      expect(model).not_to allow_value(*bad_values).for(:attr)
+      expect(model).
+        not_to allow_value(*bad_values).
+        for(:attr).
+        ignoring_interference_by_writer
     end
 
     it "does not match given good values along with bad values" do
@@ -241,48 +249,139 @@ describe Shoulda::Matchers::ActiveModel::AllowValueMatcher, type: :model do
     end
   end
 
-  context 'when the attribute writer method ignores a non-nil value' do
-    context 'when the attribute has a reader method' do
-      it 'raises a CouldNotSetAttributeError' do
-        model = define_active_model_class 'Example' do
-          attr_reader :name
+  context 'when the attribute interferes with attempts to be set' do
+    context 'when the matcher has not been qualified with #ignoring_interference_by_writer' do
+      context 'when the attribute cannot be changed from nil to non-nil' do
+        it 'raises a CouldNotSetAttributeError' do
+          model = define_active_model_class 'Example' do
+            attr_reader :name
 
-          def name=(_value)
-            nil
+            def name=(_value)
+              nil
+            end
           end
+
+          assertion = -> {
+            expect(model.new).to allow_value('anything').for(:name)
+          }
+
+          expect(&assertion).to raise_error(
+            described_class::CouldNotSetAttributeError
+          )
         end
+      end
 
-        assertion = -> {
-          expect(model.new).to allow_value('anything').for(:name)
-        }
+      context 'when the attribute cannot be changed from non-nil to nil' do
+        it 'raises a CouldNotSetAttribute error' do
+          model = define_active_model_class 'Example' do
+            attr_reader :name
 
-        expect(&assertion).to raise_error(
-          Shoulda::Matchers::ActiveModel::AllowValueMatcher::CouldNotSetAttributeError
-        )
+            def name=(value)
+              @name = value unless value.nil?
+            end
+          end
+
+          record = model.new(name: 'some name')
+
+          assertion = -> {
+            expect(record).to allow_value(nil).for(:name)
+          }
+
+          expect(&assertion).to raise_error(
+            described_class::CouldNotSetAttributeError
+          )
+        end
+      end
+
+      context 'when the attribute cannot be changed from a non-nil value to another non-nil value' do
+        it 'raises a CouldNotSetAttribute error' do
+          model = define_active_model_class 'Example' do
+            attr_reader :name
+
+            def name=(_value)
+              @name = 'constant name'
+            end
+          end
+
+          record = model.new(name: 'some name')
+
+          assertion = -> {
+            expect(record).to allow_value('another name').for(:name)
+          }
+
+          expect(&assertion).to raise_error(
+            described_class::CouldNotSetAttributeError
+          )
+        end
       end
     end
-  end
 
-  context 'when the attribute writer method ignores a nil value' do
-    context 'when the attribute has a reader method' do
-      it 'raises a CouldNotSetAttribute error' do
-        model = define_active_model_class 'Example' do
-          attr_reader :name
+    context 'when the matcher has been qualified with #ignoring_interference_by_writer' do
+      context 'when the attribute cannot be changed from nil to non-nil' do
+        it 'does not raise an error at all' do
+          model = define_active_model_class 'Example' do
+            attr_reader :name
 
-          def name=(value)
-            @name = value unless value.nil?
+            def name=(_value)
+              nil
+            end
           end
+
+          assertion = lambda do
+            expect(model.new).
+              to allow_value('anything').
+              for(:name).
+              ignoring_interference_by_writer
+          end
+
+          expect(&assertion).not_to raise_error
         end
+      end
 
-        record = model.new(name: 'some name')
+      context 'when the attribute cannot be changed from non-nil to nil' do
+        it 'does not raise an error at all' do
+          model = define_active_model_class 'Example' do
+            attr_reader :name
 
-        assertion = -> {
-          expect(record).to allow_value(nil).for(:name)
-        }
+            def name=(value)
+              @name = value unless value.nil?
+            end
+          end
 
-        expect(&assertion).to raise_error(
-          Shoulda::Matchers::ActiveModel::AllowValueMatcher::CouldNotSetAttributeError
-        )
+          record = model.new(name: 'some name')
+
+          assertion = lambda do
+            expect(record).
+              to allow_value(nil).
+              for(:name).
+              ignoring_interference_by_writer
+          end
+
+          expect(&assertion).not_to raise_error
+        end
+      end
+
+      context 'when the attribute cannot be changed from a non-nil value to another non-nil value' do
+        it 'does not raise an error at all' do
+          model = define_active_model_class 'Example' do
+            attr_reader :name
+
+            def name=(_value)
+              @name = 'constant name'
+            end
+          end
+
+          record = model.new(name: 'some name')
+
+          assertion = lambda do
+            expect(record).
+              to allow_value('another name').
+              for(:name).
+              ignoring_interference_by_writer
+          end
+
+          expect(&assertion).not_to raise_error
+        end
       end
     end
   end
diff --git a/spec/unit/shoulda/matchers/active_model/validate_acceptance_of_matcher_spec.rb b/spec/unit/shoulda/matchers/active_model/validate_acceptance_of_matcher_spec.rb
index 7c41ee33..467ec719 100644
--- a/spec/unit/shoulda/matchers/active_model/validate_acceptance_of_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/active_model/validate_acceptance_of_matcher_spec.rb
@@ -3,28 +3,28 @@ require 'unit_spec_helper'
 describe Shoulda::Matchers::ActiveModel::ValidateAcceptanceOfMatcher, type: :model do
   context 'a model with an acceptance validation' do
     it 'accepts when the attributes match' do
-      expect(validating_acceptance).to matcher
+      expect(record_validating_acceptance).to matcher
     end
 
     it 'does not overwrite the default message with nil' do
-      expect(validating_acceptance).to matcher.with_message(nil)
+      expect(record_validating_acceptance).to matcher.with_message(nil)
     end
   end
 
   context 'a model without an acceptance validation' do
     it 'rejects' do
-      expect(define_model(:example, attr: :string).new).not_to matcher
+      expect(record_validating_nothing).not_to matcher
     end
   end
 
   context 'an attribute which must be accepted with a custom message' do
     it 'accepts when the message matches' do
-      expect(validating_acceptance(message: 'custom')).
+      expect(record_validating_acceptance(message: 'custom')).
         to matcher.with_message(/custom/)
     end
 
     it 'rejects when the message does not match' do
-      expect(validating_acceptance(message: 'custom')).
+      expect(record_validating_acceptance(message: 'custom')).
         not_to matcher.with_message(/wrong/)
     end
   end
@@ -33,9 +33,21 @@ describe Shoulda::Matchers::ActiveModel::ValidateAcceptanceOfMatcher, type: :mod
     validate_acceptance_of(:attr)
   end
 
-  def validating_acceptance(options = {})
-    define_model(:example, attr: :string) do
+  def model_validating_nothing(&block)
+    define_active_model_class(:example, accessors: [:attr], &block)
+  end
+
+  def record_validating_nothing
+    model_validating_nothing.new
+  end
+
+  def model_validating_acceptance(options = {})
+    model_validating_nothing do
       validates_acceptance_of :attr, options
-    end.new
+    end
+  end
+
+  def record_validating_acceptance(options = {})
+    model_validating_acceptance(options).new
   end
 end
diff --git a/spec/unit/shoulda/matchers/active_model/validate_numericality_of_matcher_spec.rb b/spec/unit/shoulda/matchers/active_model/validate_numericality_of_matcher_spec.rb
index 2bd2df3f..02565b45 100644
--- a/spec/unit/shoulda/matchers/active_model/validate_numericality_of_matcher_spec.rb
+++ b/spec/unit/shoulda/matchers/active_model/validate_numericality_of_matcher_spec.rb
@@ -229,20 +229,6 @@ describe Shoulda::Matchers::ActiveModel::ValidateNumericalityOfMatcher, type: :m
         )
         expect(record).to validate_numericality.is_less_than_or_equal_to(18)
       end
-
-      context 'if the given value is right at the allowed max value for the column' do
-        it 'does not raise an error' do
-          record = build_record_with_integer_column_of_limit(2,
-            less_than_or_equal_to: 32767
-          )
-          assertion = lambda do
-            expect(record).
-              to validate_numericality.
-              is_less_than_or_equal_to(32767)
-          end
-          expect(&assertion).not_to raise_error
-        end
-      end
     end
 
     context 'and not validating with less_than_or_equal_to' do
@@ -268,16 +254,6 @@ describe Shoulda::Matchers::ActiveModel::ValidateNumericalityOfMatcher, type: :m
           to validate_numericality.
           is_less_than(18)
       end
-
-      context 'if the given value is right at the allowed max value for the column' do
-        it 'does not raise an error' do
-          record = build_record_with_integer_column_of_limit(2, less_than: 32767)
-          assertion = lambda do
-            expect(record).to validate_numericality.is_less_than(32767)
-          end
-          expect(&assertion).not_to raise_error
-        end
-      end
     end
 
     context 'and not validating with less_than' do
@@ -301,26 +277,6 @@ describe Shoulda::Matchers::ActiveModel::ValidateNumericalityOfMatcher, type: :m
         record = build_record_validating_numericality(equal_to: 18)
         expect(record).to validate_numericality.is_equal_to(18)
       end
-
-      context 'if the given value is right at the allowed min value for the column' do
-        it 'does not raise an error' do
-          record = build_record_with_integer_column_of_limit(2, equal_to: -32768)
-          assertion = lambda do
-            expect(record).to validate_numericality.is_equal_to(-32768)
-          end
-          expect(&assertion).not_to raise_error
-        end
-      end
-
-      context 'if the given value is right at the allowed max value for the column' do
-        it 'does not raise an error' do
-          record = build_record_with_integer_column_of_limit(2, equal_to: 32767)
-          assertion = lambda do
-            expect(record).to validate_numericality.is_equal_to(32767)
-          end
-          expect(&assertion).not_to raise_error
-        end
-      end
     end
 
     context 'and not validating with equal_to' do
@@ -346,20 +302,6 @@ describe Shoulda::Matchers::ActiveModel::ValidateNumericalityOfMatcher, type: :m
           to validate_numericality.
           is_greater_than_or_equal_to(18)
       end
-
-      context 'if the given value is right at the allowed min value for the column' do
-        it 'does not raise an error' do
-          record = build_record_with_integer_column_of_limit(2,
-            greater_than_or_equal_to: -32768
-          )
-          assertion = lambda do
-            expect(record).
-              to validate_numericality_of(:attr).
-              is_greater_than_or_equal_to(-32768)
-          end
-          expect(&assertion).not_to raise_error
-        end
-      end
     end
 
     context 'not validating with greater_than_or_equal_to' do
@@ -385,20 +327,6 @@ describe Shoulda::Matchers::ActiveModel::ValidateNumericalityOfMatcher, type: :m
           to validate_numericality.
           is_greater_than(18)
       end
-
-      context 'if the given value is right at the allowed min value for the column' do
-        it 'does not raise an error' do
-          record = build_record_with_integer_column_of_limit(2,
-            greater_than: -32768
-          )
-          assertion = lambda do
-            expect(record).
-              to validate_numericality_of(:attr).
-              is_greater_than(-32768)
-          end
-          expect(&assertion).not_to raise_error
-        end
-      end
     end
 
     context 'and not validating with greater_than' do
@@ -511,13 +439,11 @@ describe Shoulda::Matchers::ActiveModel::ValidateNumericalityOfMatcher, type: :m
             only_integer.
             is_greater_than(18)
         end
-        message = format_message_according_to_rails_version(
-          <<-MESSAGE.strip_heredoc
-            Expected errors to include "must be an integer" when attr is set to 0.1,
-            got errors:
-            * "must be greater than 18" (attribute: attr, value: "0.1")
-          MESSAGE
-        )
+        message = <<-MESSAGE.strip_heredoc
+          Expected errors to include "must be an integer" when attr is set to "0.1",
+          got errors:
+          * "must be greater than 18" (attribute: attr, value: "0.1")
+        MESSAGE
         expect(&assertion).to fail_with_message(message)
       end
 
@@ -529,13 +455,11 @@ describe Shoulda::Matchers::ActiveModel::ValidateNumericalityOfMatcher, type: :m
             only_integer.
             is_greater_than(18)
         end
-        message = format_message_according_to_rails_version(
-          <<-MESSAGE.strip_heredoc
-            Expected errors to include "must be an integer" when attr is set to 0.1,
-            got errors:
-            * "must be greater than 18" (attribute: attr, value: "0.1")
-          MESSAGE
-        )
+        message = <<-MESSAGE.strip_heredoc
+          Expected errors to include "must be an integer" when attr is set to "0.1",
+          got errors:
+          * "must be greater than 18" (attribute: attr, value: "0.1")
+        MESSAGE
         expect(&assertion).to fail_with_message(message)
       end
 
@@ -550,12 +474,10 @@ describe Shoulda::Matchers::ActiveModel::ValidateNumericalityOfMatcher, type: :m
             even.
             is_greater_than(18)
         end
-        message = format_message_according_to_rails_version(
-          <<-MESSAGE.strip_heredoc
-            Expected errors to include "must be greater than 18" when attr is set to 18,
-            got no errors
-          MESSAGE
-        )
+        message = <<-MESSAGE.strip_heredoc
+          Expected errors to include "must be greater than 18" when attr is set to "18",
+          got no errors
+        MESSAGE
         expect(&assertion).to fail_with_message(message)
       end
 
@@ -570,13 +492,11 @@ describe Shoulda::Matchers::ActiveModel::ValidateNumericalityOfMatcher, type: :m
             even.
             is_greater_than(18)
         end
-        message = format_message_according_to_rails_version(
-          <<-MESSAGE.strip_heredoc
-            Expected errors to include "must be even" when attr is set to 1,
-            got errors:
-            * "must be greater than 18" (attribute: attr, value: "1")
-          MESSAGE
-        )
+        message = <<-MESSAGE.strip_heredoc
+          Expected errors to include "must be even" when attr is set to "1",
+          got errors:
+          * "must be greater than 18" (attribute: attr, value: "1")
+        MESSAGE
         expect(&assertion).to fail_with_message(message)
       end
 
@@ -591,12 +511,10 @@ describe Shoulda::Matchers::ActiveModel::ValidateNumericalityOfMatcher, type: :m
             odd.
             is_less_than_or_equal_to(99)
         end
-        message = format_message_according_to_rails_version(
-          <<-MESSAGE.strip_heredoc
-            Expected errors to include "must be less than or equal to 99" when attr is set to 101,
-            got no errors
-          MESSAGE
-        )
+        message = <<-MESSAGE.strip_heredoc
+          Expected errors to include "must be less than or equal to 99" when attr is set to "101",
+          got no errors
+        MESSAGE
         expect(&assertion).to fail_with_message(message)
       end
 
@@ -613,12 +531,10 @@ describe Shoulda::Matchers::ActiveModel::ValidateNumericalityOfMatcher, type: :m
             is_greater_than(18).
             is_less_than(99)
         end
-        message = format_message_according_to_rails_version(
-          <<-MESSAGE.strip_heredoc
-            Expected errors to include "must be greater than 18" when attr is set to 18,
-            got no errors
-          MESSAGE
-        )
+        message = <<-MESSAGE.strip_heredoc
+          Expected errors to include "must be greater than 18" when attr is set to "18",
+          got no errors
+        MESSAGE
         expect(&assertion).to fail_with_message(message)
       end
     end
@@ -635,13 +551,11 @@ describe Shoulda::Matchers::ActiveModel::ValidateNumericalityOfMatcher, type: :m
             only_integer.
             is_greater_than(18)
         end
-        message = format_message_according_to_rails_version(
-          <<-MESSAGE.strip_heredoc
-            Expected errors to include "must be greater than 18" when attr is set to 18,
-            got errors:
-            * "must be greater than 19" (attribute: attr, value: "19")
-          MESSAGE
-        )
+        message = <<-MESSAGE.strip_heredoc
+          Expected errors to include "must be greater than 18" when attr is set to "18",
+          got errors:
+          * "must be greater than 19" (attribute: attr, value: "19")
+        MESSAGE
         expect(&assertion).to fail_with_message(message)
       end
 
@@ -656,12 +570,10 @@ describe Shoulda::Matchers::ActiveModel::ValidateNumericalityOfMatcher, type: :m
             only_integer.
             is_greater_than(18)
         end
-        message = format_message_according_to_rails_version(
-          <<-MESSAGE.strip_heredoc
-            Expected errors to include "must be greater than 18" when attr is set to 18,
-            got no errors
-          MESSAGE
-        )
+        message = <<-MESSAGE.strip_heredoc
+          Expected errors to include "must be greater than 18" when attr is set to "18",
+          got no errors
+        MESSAGE
         expect(&assertion).to fail_with_message(message)
       end
 
@@ -676,13 +588,11 @@ describe Shoulda::Matchers::ActiveModel::ValidateNumericalityOfMatcher, type: :m
             even.
             is_greater_than(18)
         end
-        message = format_message_according_to_rails_version(
-          <<-MESSAGE.strip_heredoc
-            Expected errors to include "must be greater than 18" when attr is set to 18,
-            got errors:
-            * "must be greater than 20" (attribute: attr, value: "20")
-          MESSAGE
-        )
+        message = <<-MESSAGE.strip_heredoc
+          Expected errors to include "must be greater than 18" when attr is set to "18",
+          got errors:
+          * "must be greater than 20" (attribute: attr, value: "20")
+        MESSAGE
         expect(&assertion).to fail_with_message(message)
       end
 
@@ -697,12 +607,10 @@ describe Shoulda::Matchers::ActiveModel::ValidateNumericalityOfMatcher, type: :m
             even.
             is_greater_than(18)
         end
-        message = format_message_according_to_rails_version(
-          <<-MESSAGE.strip_heredoc
-            Expected errors to include "must be greater than 18" when attr is set to 18,
-            got no errors
-          MESSAGE
-        )
+        message = <<-MESSAGE.strip_heredoc
+          Expected errors to include "must be greater than 18" when attr is set to "18",
+          got no errors
+        MESSAGE
         expect(&assertion).to fail_with_message(message)
       end
 
@@ -717,12 +625,10 @@ describe Shoulda::Matchers::ActiveModel::ValidateNumericalityOfMatcher, type: :m
             odd.
             is_less_than_or_equal_to(99)
         end
-        message = format_message_according_to_rails_version(
-          <<-MESSAGE.strip_heredoc
-            Expected errors to include "must be less than or equal to 99" when attr is set to 101,
-            got no errors
-          MESSAGE
-        )
+        message = <<-MESSAGE.strip_heredoc
+          Expected errors to include "must be less than or equal to 99" when attr is set to "101",
+          got no errors
+        MESSAGE
         expect(&assertion).to fail_with_message(message)
       end
 
@@ -737,13 +643,11 @@ describe Shoulda::Matchers::ActiveModel::ValidateNumericalityOfMatcher, type: :m
             odd.
             is_less_than_or_equal_to(99)
         end
-        message = format_message_according_to_rails_version(
-          <<-MESSAGE.strip_heredoc
-            Expected errors to include "must be less than or equal to 99" when attr is set to 101,
-            got errors:
-            * "must be less than or equal to 97" (attribute: attr, value: "101")
-          MESSAGE
-        )
+        message = <<-MESSAGE.strip_heredoc
+          Expected errors to include "must be less than or equal to 99" when attr is set to "101",
+          got errors:
+          * "must be less than or equal to 97" (attribute: attr, value: "101")
+        MESSAGE
         expect(&assertion).to fail_with_message(message)
       end
 
@@ -760,13 +664,11 @@ describe Shoulda::Matchers::ActiveModel::ValidateNumericalityOfMatcher, type: :m
             is_greater_than(18).
             is_less_than(99)
         end
-        message = format_message_according_to_rails_version(
-          <<-MESSAGE.strip_heredoc
-            Expected errors to include "must be greater than 18" when attr is set to 18,
-            got errors:
-            * "must be greater than 19" (attribute: attr, value: "19")
-          MESSAGE
-        )
+        message = <<-MESSAGE.strip_heredoc
+          Expected errors to include "must be greater than 18" when attr is set to "18",
+          got errors:
+          * "must be greater than 19" (attribute: attr, value: "19")
+        MESSAGE
         expect(&assertion).to fail_with_message(message)
       end
 
@@ -783,13 +685,11 @@ describe Shoulda::Matchers::ActiveModel::ValidateNumericalityOfMatcher, type: :m
             is_greater_than(18).
             is_less_than(99)
         end
-        message = format_message_according_to_rails_version(
-          <<-MESSAGE.strip_heredoc
-            Expected errors to include "must be less than 99" when attr is set to 100,
-            got errors:
-            * "must be less than 100" (attribute: attr, value: "100")
-          MESSAGE
-        )
+        message = <<-MESSAGE.strip_heredoc
+          Expected errors to include "must be less than 99" when attr is set to "100",
+          got errors:
+          * "must be less than 100" (attribute: attr, value: "100")
+        MESSAGE
         expect(&assertion).to fail_with_message(message)
       end
     end
@@ -970,23 +870,4 @@ describe Shoulda::Matchers::ActiveModel::ValidateNumericalityOfMatcher, type: :m
   def attribute_name
     :attr
   end
-
-  def define_model_with_integer_column_of_limit(limit, validation_options = {})
-    column_options = { type: :integer, options: { limit: limit } }
-    define_model :example, attribute_name => column_options do |model|
-      model.validates_numericality_of(attribute_name, validation_options)
-    end
-  end
-
-  def build_record_with_integer_column_of_limit(limit, validation_options = {})
-    define_model_with_integer_column_of_limit(limit, validation_options).new
-  end
-
-  def format_message_according_to_rails_version(message)
-    if rails_gte_4_2?
-      message
-    else
-      message.gsub(/"((?:\d+)(?:\.\d+)?)"/, '\1')
-    end
-  end
 end