Thanks Carl Meyer and Tim Graham for the reviews and to all involved
in the discussion.

This fixes serialization of a ForeignKey to a UUIDField as the
test indicates.

Thanks Loic for help and Simon for review.

Previously Django only checked for the table name in CreateModel
operations in initial migrations and faked the migration automatically.
This led to various errors and unexpected behavior. The newly introduced
--fake-initial flag to the migrate command must be passed to get the
same behavior again. With this change Django will bail out in with a
"duplicate relation / table" error instead.

Thanks Carl Meyer and Tim Graham for the documentation update, report
and review.

Thanks Tim Graham for the patch

Thanks Carl Meyer and Markus Holtermann for the reviews.

This allows using a UUIDField primary key along with the JSON session
serializer.

Thanks to Trac alias jamesbeith for the report and Simon Charette
for the initial patch.

This is a performance optimization and also fixes test errors with the
upcoming merge of contrib tests into tests/. The tests failed on MySQL
because the models with GeometryField were being checked but the
non-GIS MySQL backend didn't know how to handle them.