corates a function that uses keyword only parameters to also allow them being passed as positionals.

    For example, consider the use case of changing the signature of ``old_fn`` into the one from ``new_fn``:

    .. code::

        def old_fn(foo, bar, baz=None):
            ...

        def new_fn(foo, *, bar, baz=None):
            ...

    Calling ``old_fn("foo", "bar, "baz")`` was valid, but the same call is no longer valid with ``new_fn``. To keep BC
    and at the same time warn the user of the deprecation, this decorator can be used:

    .. code::

        @kwonly_to_pos_or_kw
        def new_fn(foo, *, bar, baz=None):
            ...

        new_fn("foo", "bar, "baz")
    c