Document bytes as another valid input type for lobject.write()

[nickzandbergen]

I'm not sure what the correct syntax should be, since 3.9 uses Union[t1, t2] for representing multiple types.

[dvarrazzo]

That documentation predates the Python types annotation, so it most places it would be informal (e.g. write(str or bytes)). What you propose is well understandable, it would be ok for me to use.

[nickzandbergen]

Thanks for letting me know, I'll mark this as ready for review as-is then.

[dvarrazzo]

Thank you very much!