1.13.1

Released: December 20, 2023

bug

• [bug] [autogenerate] Fixed Rewriter so that more than two instances could be chained
  together correctly, also allowing multiple process_revision_directives
  callables to be chained. Pull request courtesy zrotceh.

  References: #1337

• [bug] [environment] Fixed issue where the method EnvironmentContext.get_x_argument()
  using the EnvironmentContext.get_x_argument.as_dictionary
  parameter would fail if an argument key were passed on the command line as
  a name alone, that is, without an equal sign = or a value. Behavior is
  repaired where this condition is detected and will return a blank string
  for the given key, consistent with the behavior where the = sign is
  present and no value. Pull request courtesy Iuri de Silvio.

  References: #1369

• [bug] [autogenerate] Fixed issue where the "unique" flag of an Index would not be maintained
  when generating downgrade migrations. Pull request courtesy Iuri de
  Silvio.

  References: #1370

• [bug] [versioning] Fixed bug in versioning model where a downgrade across a revision with two
  down revisions with one down revision depending on the other, would produce
  an erroneous state in the alembic_version table, making upgrades impossible
  without manually repairing the table. Thanks much to Saif Hakim for
  the great work on this.

  References: #1373

• [bug] [typing] Updated pep-484 typing to pass mypy "strict" mode, however including
  per-module qualifications for specific typing elements not yet complete.
  This allows us to catch specific typing issues that have been ongoing
  such as import symbols not properly exported.

  References: #1377