with Debian dir b53d1bfeb1add3e633bc7682554251e04c5bd5ca

make mypy 0.730 pass cleanly again

with Debian dir ec9ec5a8758255c5901a7cbc5800c3dde3493516

with Debian dir 294af68554d83dcc24b50caa2ff2b47702964d10

with Debian dir 13f2cc753f39dbbff732279ae6a48ecf4a9516e4

Needed by the replayer in swh-journal.

with Debian dir da13c61a77431bbfd0ffb08fff8fcdfed1989d4e

with Debian dir 2e23d1f94249265cf074e48e4d9f41f9aa7574e8

It kind of matches the current state of the postgresql storage, which
does not support it.

But keep support for deserializing from str, like
swh-storage does.

with Debian dir 61ff8c95c9f4d4dcb1f4f60fdc85584fb19af9ad

Code manipulating a Content object may want to access a hash
of configurable name; this method allows it to do that
without using getattr directly.

It denotes files whose length is unknown.