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.

when a GC collection happens in another thread.

Original patch and report by Armin Rigo.

when a GC collection happens in another thread.

Original patch and report by Armin Rigo.

strxfrm() functions.

doesn't own its elements as limits.

doesn't own its elements as limits.

doesn't own its elements as limits.

Patch by Jim Fasarakis-Hilliard.

Patch by Dillon Brock.

form.

form.

form.