Issue #18808: Non-daemon threads are now automatically joined when a sub-interpreter is shutdown (it would previously dump a fatal error).

preexec_fn callback, which may open file descriptors.

preexec_fn callback, which may open file descriptors.

Vajrasky Kok.

Previously it generated them if they were given a value, but completely
ignored them if they were present in the string passed in to be parsed.  Now
if the flag appears on a cookie, the corresponding Morsel key will reference a
True value.  Other pre-existing behavior is retained in this maintenance
patch: if the source contains something like 'secure=foo', morsel['secure']
will return 'foo'.  Since such a value doesn't round trip and never did (and
would be a surprising occurrence) a subsequent non-bug-fix patch may change
this behavior.

Inspired by a patch from Julien Phalip, who reviewed this one.

properly handled as unsigned.

properly handled as unsigned.

thanks to Vajrasky Kok for proof-reading.

thanks to Vajrasky Kok for proof-reading.

Closes #18807: pyvenv now takes a --copies argument allowing copies instead of symlinks even where symlinks are available and the default.

The return value of close() is not always a toplevel element. It depends on
what the underlying target returns. By default, TreeBuilder returns the
toplevel document element.

(grafted from 23181bf411a16287a0a54e910fc0f9ecd2764bf0)

Patch by Michele Orrù.

Do we need a fallback implementation of getcwd() from 1991 that claims to
support "really old Unix systems"? I don't think so.

Patch by Stefan Behnel.

#18796: improve documentation of the file argument of dis.show_code.  Initial patch by Vajrasky Kok.