Misc/NEWS.d/next/Library/2019-06-23-12-46-10.bpo-26967.xEuem1.rst

An :class:`~argparse.ArgumentParser` with ``allow_abbrev=False`` no longer
disables grouping of short flags, such as ``-vv``, but only disables
abbreviation of long flags as documented. Patch by Zac Hatfield-Dodds.