options-first does not work on positionals within group

[felixSchl]

Failing test case:

r"""
Usage: foo [[<args>]...]
"""

$ prog/p bar -a -b -c
{ "ARGS": ["bar", "-a", "-b", "-c"], "<args>": ["bar", "-a", "-b", "-c"]}

Errors with: Trailing input: -a, -b, -c