[PATCH] ActiveRecord does not write invalid datetime and timestamp data when enable time zone support

Suppose I have a model "Event" with datetime and timestamp attributes, and we assign invalid data to them:

ActiveRecord::Base.time_zone_aware_attributes
=> true
e = Event.new( :datetime => "AAA", :timestamp => "BBB", :integer => "CCC" )
e.attributes_before_type_cast
=> { "datetime" => nil, "timestamp" => nil, "integer" => "CCC" }

Expect:

=> { "datetime" => "AAA", "timestamp" => "BBB", "integer" => "CCC }

BTW, the result is right if we disable time zone support:

ActiveRecord::Base.time_zone_aware_attributes = false
e = Event.new( :datetime => "AAA", :timestamp => "BBB", :integer => "CCC" )
e.attributes_before_type_cast
=> { "datetime" => "AAA", "timestamp" => "BBB", "integer" => "CCC }