Issue #19591: Use specific asserts in ctype tests.
Issue #19594: Use specific asserts in unittest tests.
Issue #19600: Use specific asserts in distutils tests.
Issue #19601: Use specific asserts in sqlite3 tests.
Issue #19602: Use specific asserts in tkinter tests.
Issue #19604: Use specific asserts in array tests.
#19238: fix typo in documentation.
Merge heads
Fix merge error in issue #19602.
Issue #19605: Use specific asserts in datetime tests
Issue #19607: Use specific asserts in weakref tests.
Issue #19606: Use specific asserts in cookielib tests.
Issue #19508: warn that ssl doesn't validate certificates by default