[issue32833] argparse doesn't recognise two option aliases as equal

[Krzysztof Leszczyński]

New submission from Krzysztof Leszczyński <chris.lesz at gmail.com>:

Step to reproduce:

import argparse
ap=argparse.ArgumentParser()
ap.add_argument("--a-b", "--ab")
v1=ap.parse_args(["--ab", "xx"])
print(v1)
# v1==Namespace(a_b='xx')
v2=ap.parse_args(["--a", "xx"])
# v2 should be equal to v1 but instead it raises an error, in spite that --a-b and --ab are aliases

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32833>
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