Revert use singular for -1 (commits
9ee7d533da and
5da9868ed9
Turns out you can specify negative values using plurals:
https://english.stackexchange.com/questions/9735/is-1-followed-by-a-singular-or-plural-noun
so the previous code was correct enough, and consistent with other usage
in our code. Also add comment in the two places where this could be
confused.
Reported-by: Noah Misch
Diagnosed-by: 20210425115726.GA2353095@rfd.leadboat.com