gh-138525: Support single-dash long options and prefix_chars in BooleanOptionalAction#138692

serhiy-storchaka wants to merge 1 commit intopython:mainpython/cpython:mainfrom

serhiy-storchaka:BooleanOptionalAction-prefix_charsserhiy-storchaka/cpython:BooleanOptionalAction-prefix_charsCopy head branch name to clipboard