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9680e6483f
only the DAY TO SECOND interval type so far due to lack of support in cx_oracle for YEAR TO MONTH. [ticket:1467] - The Interval type includes a "native" flag which controls if native INTERVAL types (postgresql + oracle) are selected if available, or not. "day_precision" and "second_precision" arguments are also added which propagate as appropriately to these native types. Related to [ticket:1467]. - DefaultDialect.type_descriptor moves back to being per-dialect. TypeEngine/TypeDecorator key type impls to the dialect class + server_version_info so that the colspecs dict can be modified per-dialect based on server version. - Fixed TypeDecorator's incorrect usage of _impl_dict