do not dup Pry::Config::Lazy objects on read from default.

lib/pry.rb

@@ -111,6 +111,7 @@ require 'pry/plugins'
 require 'pry/core_extensions'
 require 'pry/basic_object'
 require "pry/prompt"
+require 'pry/config/lazy'
 require 'pry/config/behavior'
 require 'pry/config/memoization'
 require 'pry/config/default'

lib/pry/config.rb

@@ -2,30 +2,6 @@ class Pry
   # The Pry config.
   # @api public
   class Config < Pry::BasicObject
-    # Wraps a block so it can have a name.
-    #
-    # @example
-    #   proc1 = proc {}
-    #   proc2 = Pry::Config::Lazy.new(&proc {})
-    #
-    #   proc1.is_a?(Pry::Config::Lazy)
-    #   #=> false
-    #   proc2.is_a?(Pry::Config::Lazy)
-    #   #=> true
-    #
-    # @api private
-    # @since v0.12.0
-    class Lazy
-      def initialize(&block)
-        @block = block
-      end
-
-      # @return [Object]
-      def call
-        @block.call
-      end
-    end
-
     include Behavior
 
     def self.shortcuts

lib/pry/config/behavior.rb

@@ -6,7 +6,7 @@ class Pry
 
       NODUP = [
         TrueClass, FalseClass, NilClass, Symbol, Numeric, Module, Proc,
-        Pry::Prompt
+        Pry::Prompt, Pry::Config::Lazy
       ].freeze
 
       INSPECT_REGEXP = /#{Regexp.escape "default=#<"}/

lib/pry/config/lazy.rb

@@ -0,0 +1,27 @@
+class Pry
+  class Config < Pry::BasicObject
+    # Wraps a block so it can have a name.
+    #
+    # @example
+    #   proc1 = proc {}
+    #   proc2 = Pry::Config::Lazy.new(&proc {})
+    #
+    #   proc1.is_a?(Pry::Config::Lazy)
+    #   #=> false
+    #   proc2.is_a?(Pry::Config::Lazy)
+    #   #=> true
+    #
+    # @api private
+    # @since v0.12.0
+    class Lazy
+      def initialize(&block)
+        @block = block
+      end
+
+      # @return [Object]
+      def call
+        @block.call
+      end
+    end
+  end
+end