bpo-33781: audioop: enhance rounding double as int (GH-7447)


Move the floor() call into fbound() to call floor() on a double
rather than an int. The change should enhance the rounding.

Document also (int)double rounding mode.
(cherry picked from commit 45e4efba7fa2abe61d25e4f8b5bf482e19ff1280)

Co-authored-by: Victor Stinner <vstinner@redhat.com>
1 file changed