Remove DEFAULT_VALIDATION_OPTIONS from validations

activemodel/lib/active_model/validations.rb

@@ -9,8 +9,6 @@ def self.included(base) # :nodoc:
     end
 
     module ClassMethods
-      DEFAULT_VALIDATION_OPTIONS = { :on => :save, :allow_nil => false, :allow_blank => false, :message => nil }.freeze
-
       # Adds a validation method or block to the class. This is useful when
       # overriding the +validate+ instance method becomes too unwieldly and
       # you're looking for more descriptive declaration of your validations.

activemodel/lib/active_model/validations/length.rb

@@ -40,9 +40,7 @@ module ClassMethods
       #   Defaults to <tt>lambda{ |value| value.split(//) }</tt> which counts individual characters.
       def validates_length_of(*attrs)
         # Merge given options with defaults.
-        options = {
-          :tokenizer => lambda {|value| value.split(//)}
-        }.merge(DEFAULT_VALIDATION_OPTIONS)
+        options = { :tokenizer => lambda {|value| value.split(//)} }
         options.update(attrs.extract_options!.symbolize_keys)
 
         # Ensure that one and only one range option is specified.