old behavior).

forever on incomplete input. That caused tarfile.open() to hang when used
with mode 'r' or 'r:bz2' and a fileobj argument that contained no data or
partial bzip2 compressed data.

(backported from r70523)

See issue #5389.

Added test case to ensure attempts to read from a file opened for writing
fail.

EOF was hit.

Issue #4342: Always convert Text.index result to string.

Issue #1683: prevent forking from interfering in threading storage.

Issue #3863: Disabled a unit test of fork being called from a thread
when running on platforms known to exhibit OS bugs when attempting that.

in struct's L format.

Decimal.max_mag and Decimal.min_mag.

propagating exceptions.

context manager's __exit__ method's result while it's being converted to bool.

Backport of r67266