validate_each in NumericalityValidator is never called in this case.

NumericalityValidator#validate_each is never called when allow_nil is true and
the value is nil because it is already skipped in EachValidator#validate.

activemodel/lib/active_model/validations/numericality.rb

@@ -26,8 +26,6 @@ def validate_each(record, attr_name, value)
           raw_value = value
         end
 
-        return if options[:allow_nil] && raw_value.nil?
-
         unless is_number?(raw_value)
           record.errors.add(attr_name, :not_a_number, filtered_options(raw_value))
           return