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To wrap this up, the correct way to specify that 2 or more positionals share a 'dest' is to supply that dest as the first parameter. If the help should have something else, use the `metavar`.
 import argparse
 parser = argparse.ArgumentParser()
 parser.add_argument('x', action='append_const', const=42, metavar='foo')
 parser.add_argument('x', action='append_const', const=43, metavar='bar')
 parser.print_help()
 args=parser.parse_args([])
 print(args)
produces
 usage: issue24419.py [-h]
 positional arguments:
 foo
 bar
 optional arguments:
 -h, --help show this help message and exit
 Namespace(x=[42, 43])
(I think this issue can be closed).