apply case-in-assignment pattern

activemodel/lib/active_model/type/helpers/numeric.rb

@@ -3,7 +3,8 @@ module ActiveModel
     module Helpers
       module Numeric # :nodoc:
         def cast(value)
-          value = case value
+          value = \
+            case value
             when true then 1
             when false then 0
             when ::String then value.presence

activemodel/lib/active_model/type/immutable_string.rb

@@ -17,7 +17,8 @@ module ActiveModel
       private
 
         def cast_value(value)
-          result = case value
+          result = \
+            case value
             when true then "t"
             when false then "f"
             else value.to_s