Deprecate typecasting of default property values.

lib/dm-core/resource/persistence_state/transient.rb

@@ -50,7 +50,20 @@ def set_default_values
 
  def set_default_value(subject)
  return if subject.loaded?(resource) || !subject.default?
- set(subject, subject.default_for(resource))
+ default = typecast_default(subject, subject.default_for(resource))
+ set(subject, default)
+ end
+
+ def typecast_default(subject, default)
+ return default unless subject.respond_to?(:typecast)
+
+ typecasted_default = subject.send(:typecast, default)
+ unless typecasted_default.eql?(default)
+ warn "Automatic typecasting of default property values is deprecated " +
+ "(#{default.inspect} was casted to #{typecasted_default.inspect}). " +
+ "Specify the correct type for #{resource.class}."
+ end
+ typecasted_default
  end
 
  def track(subject)