coleifer/peewee 3.11.0 on GitHub

Fixes #1991. This particular issue involves joining 3 models together in a chain, where the outer two models are empty. Previously peewee would make the middle model an empty model instance (since a link might be needed from the source model to the outermost model). But since both were empty, it is more correct to make the intervening model a NULL value on the foreign-key field rather than an empty instance.
An unrelated fix came out of the work on #1991 where hashing a model whose primary-key happened to be a foreign-key could trigger the FK resolution query. This patch fixes the Model._pk and get_id() interfaces so they no longer introduce the possibility of accidentally resolving the FK.
Allow Field.contains(), startswith() and endswith() to compare against another column-like object or expression.
Workaround for MySQL prior to 8 and MariaDB handling of union queries inside of parenthesized expressions (like IN).
Be more permissive in letting invalid values be stored in a field whose type is INTEGER or REAL, since Sqlite allows this.
TimestampField resolution cleanup. Now values 0 and 1 will resolve to a timestamp resolution of 1 second. Values 2-6 specify the number of decimal places (hundredths to microsecond), or alternatively the resolution can still be provided as a power of 10, e.g. 10, 1000 (millisecond), 1e6 (microsecond).
When self-referential foreign-keys are inherited, the foreign-key on the subclass will also be self-referential (rather than pointing to the parent model).
Add TSV import/export option to the dataset extension.
Add item interface to the dataset.Table class for doing primary-key lookup, assignment, or deletion.
Extend the mysql ReconnectMixin helper to work with mysql-connector.
Fix mapping of double-precision float in postgres schema reflection. Previously it mapped to single-precision, now it correctly uses a double.
Fix issue where PostgresqlExtDatabase and MySQLConnectorDatabase did not respect the autoconnect setting.

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