Does this need specific documentation? bytearray itself is documented with:

> As bytearray objects are mutable, they support the mutable sequence operations in addition to the common bytes and bytearray operations described in Bytes and Bytearray Operations.

where "mutable" is a link to all the mutable sequence operations ( https://docs.python.org/3/library/stdtypes.html#typesseq-mutable ), including copy. Specifically documenting copy for bytearray is pointless; are we going to add specific documentation for append and remove and all the other mutable sequence operations as well?