Patch by Stéphane Wirtel.

Patch by Alex Walters.

I have compared output between pre- and post-patch runs of these tests
to make sure there's nothing missing and nothing broken, on both
Windows and Linux.  The only differences I found were actually tests
that were previously *not* run.

(closes #18147)

(closes #18147)

   party sources. Run aclocal to import it to aclocal.m4 and add aclocal.m4
   to the archive.

   party sources. Run aclocal to import it to aclocal.m4 and add aclocal.m4
   to the archive.

array that's larger than 50% of the available RAM.

Patch by Médéric Boquien.

The concept of .pyo files no longer exists. Now .pyc files have an
optional `opt-` tag which specifies if any extra optimizations beyond
the peepholer were applied.

Patch by Eugene Toder.

while it is holding a lock to a buffered I/O object, and the main thread
tries to use the same I/O object (typically stdout or stderr).  A fatal
error is emitted instead.

while it is holding a lock to a buffered I/O object, and the main thread
tries to use the same I/O object (typically stdout or stderr).  A fatal
error is emitted instead.

Using LF can a script to fail if it tries to use a label that is
split across 512 byte blocks.  Who knows why.

Patch by Juti Noppornpitak.