There's an old school of programmers who resist double dash for long opts. Partly for historical reasons. You'll find them in ex-Bell labs people (e.g. go-lan

There's an old school of programmers who resist double dash for long opts. Partly for historical reasons. You'll find them in ex-Bell labs people (e.g. go-lang) and associated (docker). The double dash was born in the 90s; there was a poll on Usenet gnu.misc (or similar). Those who did not habituate usenet didn't get the memo.