This one always seemed to me like a plausible alternative spelling (cf. traveler for traveller).
Maybe the reviewers who let this through were speakers of British English who knew it was misspelt but conceded it without a fight, having already lost on color, gray, center...
The invention of the symbol name spellchecker a decade or so back has been a wonderful boon for me. It's a little annoying to teach it the new jargon when I'm getting started in a new codebase, but it's easily a net time saver. Catching spelling errors when you first create the new symbol is always cheaper than fixing them after it's being referenced from 15 different files and can't be fixed without another code review.
[0] https://annaken.github.io/a-brief-history-of-the-referer-hea...