bpo-11874: fix assertion failure in argparse metavar handling (GH-1826)
- bugfix and test for fragile metavar handling in argparse (see bpo-24089, bpo-14046, bpo-25058, bpo-11874) - also fixes some incorrect tests that did not make 1-element tuples correctly (cherry picked from commit 66f02aa3) Co-authored-by:wim glenn <wim.glenn@gmail.com>
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