arg removes all double dashes from the arguments, even after the first one

[cjhardekopf]

I would expect double dashes ("--") after the first one to be passed through as an argument. A simple test script:

#!/usr/bin/env -S usage bash
#USAGE min_usage_version "2"
#USAGE name "double_dash test"
#USAGE about "Test double dash behavior"
#USAGE arg "<args>..." help="Args" double_dash="automatic"

# echo args
echo "$usage_args"

The behavior appears the same no matter what double_dash behavior is specified. For example:

$ ./double_dash_test -- hello -- goodbye --
hello goodbye

I expect to see hello -- goodbye -- since I would expect everything after the first double dash to be treated as an argument.

$ usage --version
2.0.3