- Update to 8.1.6
  * Replace all typing.Dict occurrences to typing.MutableMapping for parameter
    hints. #2255
  * Improve type hinting for decorators and give all generic types parameters.
  * Fix return value and type signature of
    shell_completion.add_completion_class function. #2421
  * Bash version detection doesn’t fail on Windows. #2461
  * Completion works if there is a dot (.) in the program name. #2166
  * Improve type annotations for pyright type checker. #2268
  * Improve responsiveness of click.clear(). #2284
  * Improve command name detection when using Shiv or PEX. #2332
  * Avoid showing empty lines if command help text is empty. #2368
  * ZSH completion script works when loaded from fpath. #2344.
  * EOFError and KeyboardInterrupt tracebacks are not suppressed when
    standalone_mode is disabled. #2380
  * @group.command does not fail if the group was created with a custom
    command_class. #2416
  * multiple=True is allowed for flag options again and does not require
    setting default=(). #2246, #2292, #2295
  * Make the decorators returned by @argument() and @option() reusable when the
    cls parameter is used. #2294
  * Don’t fail when writing filenames to streams with strict errors. Replace
    invalid bytes with the replacement character (�). #2395
  * Remove unnecessary attempt to detect MSYS2 environment. #2355
  * Remove outdated and unnecessary detection of App Engine environment. #2554
  * echo() does not fail when no streams are attached, such as with pythonw on
    Windows. #2415
  * Argument with expose_value=False do not cause completion to fail. #2336
  * Fix an issue with type hints for @click.command(), @click.option(), and
    other decorators. Introduce typing tests. #2558

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