This introduces a new function, imp.extension_suffixes(), which is
currently undocumented. That is forthcoming once issue #14657 is
resolved and how to expose file suffixes is decided.

The certificate has changed and the test now needs SNI to pass.

The certificate has changed and the test now needs SNI to pass.

The address of an object was being decreffed instead of the object.

Keep inline for performance critical functions (functions used in loops)

 * The write_str() method does nothing if the length is zero.
 * Replace "struct unicode_writer_t" with "unicode_writer_t"

The length can be read directly from the buffer

"Inline" PyUnicode_Resize(): call directly resize_compact()

accumulator. Directly write characters into the output (don't use a temporary
list): resize and widen the string on demand.

Don't convert uninitialized characters. Patch written by Serhiy Storchaka.

Removed futimens as it is now redundant.
Changed shutil.copystat to use st_atime_ns and st_mtime_ns from os.stat
and ns= parameter to utime--it once again preserves exact metadata on Linux!

Use also directly unicode_empty, instead of PyUnicode_New(0,0).

Remove the fast-path for 1-character string: unicode_fromascii() and
_PyUnicode_FromUCS*() now have their own fast-path for 1-character strings.

Avoid an useless and expensive call to PyUnicode_READ().

Previously, when an error was encountered some processes would not be
stopped until atexit callbacks were run.  On Windows that was too late
to prevent a PermissionError when regrtest tried to remove the temp
directory it ran the tests in.