Two long options can result in "specified ambiguously" error

[mmastrac]

When I specify --woff given two option declarations --woff and --woff, I get an error saying that --woff is specified ambiguously 2 times

One-liner repro (after npm install docopt):

require('docopt').docopt("usage:\n--woff\n--woff2", {argv:["--woff"]})
 --woff is specified ambiguously 2 times

[arikon]

Do you plan to fix this?