CollectionScalarAttributeImpl

[Mike Bayer]

this would implement CollectionAttributeImpl for a scalar column based attribute in conjunction with column_property(), usually working with PickleType or some other user-defined serializing type (i.e. URLEncoded, etc.). The append/remove events would simply set the modified flag. This would remove the need for using MutableScalarAttributeImpl with serialized collections.

docs should be added discussing the really bad overhead of mutable types, include examples with PickleType as well as a URLEncoded type.

[Mike Bayer]

we've got http://www.sqlalchemy.org/docs/07/orm/extensions/mutable.html in 0.7 and that's it for now.

[Mike Bayer]

Removing milestone: 0.6.xx (automated comment)