[Python-Dev] Issue #11022: locale.getpreferredencoding() must not set temporary LC_CTYPE

[Victor Stinner]

> Fine with me.

Ok, done with changeset 2587328c7c9c.

> So in theory, your change should have no effect, unless somebody has
> modified some environment variables.

Changing TextIOWrapper to call locale.getpreferredlocale(False)
instead of getpreferredlocale() has these two effects:

1) without the patch, setting LC_ALL, LC_CTYPE or LANG environment
variable changes the encoding used by TextIOWrapper.

2) with the patch, setting LC_CTYPE (with locale.setlocale) changes
the the encoding used by TextIOWrapper.

IMO (2) is less surprising than (1) For example, it is the expected
behaviour of the reporter of the issue #11022.

In practice, it should not change anything for most people.

Victor