The path wasn't being taken due to an over-restrictive type check.

Patch by Oscar Benjamin.

Patch by Xavier de Gaye.

Au_read.readframes() now updates current file position and reads correct
number of frames from multichannel stream.  Au_write.writeframesraw() now
correctly updates current file position.  Au_read.getnframes() now returns an
integer (as in Python 2).  Au_read and Au_write now correctly works with file
object if start file position is not a zero.

bytes until end of data.

Since all versions since 2.2 are under the same licensing terms,
this saves the release manager from touching the two files for
very new minor release.

returned empty string.

binaries.

Addresses Issue #18553: isatty is not Unix only.

This avoids race conditions when other programs are monitoring
the maildir directory.  Patch by janzert.