Now it is in sync with https://docs.python.org/3/library/hmac.html#hmac.compare_digest
It is the same function, just re-exported. So, I guess they should mention the same input types.
.. function:: compare_digest(a, b)
- Return ``True`` if strings *a* and *b* are equal, otherwise ``False``,
+ Return ``True`` if strings or
+ :term:`bytes-like objects <bytes-like object>`
+ *a* and *b* are equal, otherwise ``False``,
using a "constant-time compare" to reduce the risk of
`timing attacks <https://codahale.com/a-lesson-in-timing-attacks/>`_.
See :func:`hmac.compare_digest` for additional details.