See: #1 (comment)

See also near bottom of FAQs, design doc says:

Is ---foo the same as --foo?

• no
• the first flag would be parsed as '-foo'
• the second flag would be parsed as 'foo'

https://github.com/pkgjs/parseargs#faqs