[ruby-core:108557] [Ruby master Bug#18783] OptionParser should recognize "-" as an optional argument

Issue #18783 has been reported by konsolebox (K B).

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Bug #18783: OptionParser should recognize "-" as an optional argument
https://bugs.ruby-lang.org/issues/18783

* Author: konsolebox (K B)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.7.4p191, ruby 3.1.2p20
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
``` ruby
require 'optparse'

optarg = nil

OptionParser.new do |parser|
  parser.on("-o", "--opt [ARG]", "Option with optional argument") do |arg|
    optarg = arg
  end
end.parse!

puts "#{optarg.inspect}, #{ARGV.inspect}"
```
Executing the code above with `-o -` as arguments outputs `nil, ["-"]` when it should produce `"-", []` instead.

OptionParser recognizes `-` as a general non-option argument but it doesn't do the same when `-` follows an option with an optional argument.

In my shell script, I consider options as `-?*` (glob) instead of `-*` so `-` is also considered as a valid argument.  Perhaps OptionParser should do the same.




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