* Wrong parameter name, 'group_by' instead of 'key_type'
* Don't round up numbers when explaining the examples. If they exactly match
  what can be read in the script output, it is to easier to understand
  (4.8 MiB vs 4855 KiB)
* Fix incorrect method link that was pointing to another module

Patch written by Loic Pefferkorn.

Based on patch by Tycho Andersen.

WeakValueDictionary when collecting from another thread.

Patch by paka.

Patch by Dhushyanth Ramasamy.

Patch by Chi Hsuan Yen.

Patch by Maciej Szulik.

Based on patch by Patrila.

Based on suggestion from Fumihiro Bessho.

setattr() must not convert combined table into split table.

Issue #28383: __hash__ documentation recommends naive XOR to combine but this
is suboptimal. Update the doc to suggest to reuse the hash() method using a
tuple, with an example.

when a GC collection happens in another thread.

Original patch and report by Armin Rigo.

Based on patch by Michael Layzell.

doesn't own its elements as limits.

Patch by Jim Fasarakis-Hilliard.

Patch by Dillon Brock.