Original patch submitted by QNX, modified for clarity by me (mostly comments).
QNX reports a 30% speed up in average email parsing time.

web-browser on the executable search path.

with size >= 2**31), instead of producing illegal marshal data.

with size >= 2**31), instead of producing illegal marshal data.

with size >= 2**31), instead of producing illegal marshal data.

the disk is full.  Original patch by Amir Szekely.

the disk is full.  Original patch by Amir Szekely.

the disk is full.  Original patch by Amir Szekely.

modernize some modules' code by replacing OSError->ENOENT/ENOTDIR/EPERM/EEXIST occurrences with the corresponding pep-3151 exceptions (FileNotFoundError, NotADirectoryError, etc.)

uid_t range.

uid_t range.

Patch by Jeremy Kloth.

Patch by Jeremy Kloth.

Patch by Jeremy Kloth.

messages.