Vilmos Nebehaj.

use list() to wrap range() in itertools.permutations() example; thanks to Romain MORLEVAT from docs@

dropped connections in case of simultaneous connection requests.

common_types was mentioned under MimeTypes class, move it to helper function
category and other documentation improvements contributed by Sandro Tosi.

Metaclasses with metaclasses with a __dict__ descriptor can no longer trigger code execution with inspect.getattr_static.
Closes issue 11829.

Issue #13597: Fix the documentation of the "-u" command-line option, and wording of "What's new in Python 3.0" about standard streams.

Also fixes issue #13581: `help(type)` wouldn't display anything.