Ellipses operator in optional arguments

I cannot seem to get the ... operator to parse correctly within optional arguments. I am migrating my project from argparse to docopt. The docstring is as follows:

rpcalc, a reverse polish notation calculator

Usage:
  rpcalc [-s N] [-i X...]
  rpcalc [-e] -i X...
  rpcalc (-h | --help)
  rpcalc --version

Options:
  -h --help     Show this screen.
  -s N          Limit length of stack to N elements.
  -i X...       Push following elements to stack.
  -e            Limit stack length to amount of elements given with -i.
  --version     Display version.

I get the following cryptic error message from docopt:

$ python3 rpcalc.py -i 1 2 3
Usage:
  rpcalc [-s N] [-i X...]
  rpcalc [-e] -i X...
  rpcalc (-h | --help)
  rpcalc --version

It looks like [-i X...] in the first Usage line is what’s causing the issue. TL;DR Can docopt handle the ellipses operator within [ ]?

[zcrisler]

Well, argparse allows options to specify multiple arguments via nargs='*' and nargs='+'. Can you elaborate on why you think it is a misfeature? I think it is a very common idiom.

[qguv]

Fair enough; thanks for the clarification. Perhaps this could be cleared up in the docs.