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Mike Bayer
1dc49abfea
The :class:`.Double` type is now used when a Python float value is detected as a literal value to be sent as a bound parameter, rather than the :class:`.Float` type. :class:`.Double` has the same implementation as :class:`.Float`, but when rendered in a CAST, produces ``DOUBLE`` or ``DOUBLE PRECISION`` rather than ``FLOAT``. The former better matches Python's ``float`` datatype which uses 8-byte double-precision storage. Third party dialects which don't support the :class:`.Double` type directly may need adjustment so that they render an appropriate keyword (e.g. ``FLOAT``) when the :class:`.Double` datatype is encountered. Fixes: #10300 Change-Id: I6d221ca9206a10c73fefad55f7ab7a6da5c81d6b