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These methods are parallel to str.join, seem to work as expected, and
have "help" entries. However there is nothing in the Library Reference
Manual about them.
>>> help(bytearray.join)
Help on method_descriptor:
join(...)
 B.join(iterable_of_bytes) -> bytearray
 Concatenate any number of bytes/bytearray objects, with B
 in between each pair, and return the result as a new bytearray.
### OK but could use an example.
>>> help(bytes.join)
Help on method_descriptor:
join(...)
 B.join(iterable_of_bytes) -> bytes
 Concatenate any number of bytes objects, with B in between each pair.
### Above sentence should read "Concatenate any number of
bytes/bytearray objects, with B in between each pair, and return the
result as a new bytes object."
 Example: b'.'.join([b'ab', b'pq', b'rs']) -> b'ab.pq.rs'.