doc: Note that zlib.flush acts after pending writes
Checklist
-
documentation is changed or added -
the commit message follows commit guidelines
Affected core subsystem(s)
doc
Description of change
Describe that zlib.flush()
may wait for pending writes. This was discussed a bit in #3782 (closed); and although it’s not really related to the original issue report there, the addition probably gives off the right impression, i.e. that flush()
is not as immediate as it may sound.