Initial patch by Gareth Rees.

parse_constant doesn't get called on 'null', 'true', 'false' since 3.1/2.7.

Patch by Mariatta Wijaya.

Without this file, clicking Help => IDLE Help did nothing.

empty compile-time PYTHONPATH components.  This fixes some tests in -S or -I
modes.

Add pointer to 'Encoding declaration' in Language Reference.

plural form selections in the gettext module.  The expression parser now
supports exact syntax supported by GNU gettext.

Patch by Anish Tambe.

the garbage collector is invoked in other thread.
Based on patch by Sebastian Cufre.

Original patch by Mariatta Wijaya.

file with compression before trying to open it without compression.  Otherwise
it had 50% chance failed with ignore_zeros=True.

This seems to be because the “timeit” module defines its own set of options

special input values as literal text.

Patch by Tim Mitchell.

a workaround to Tix library bug.

Patch by Piotr Szczepaniak.

Patch by Vajrasky Kok.