Spell out function names in `Proper`s instead of using notations.

2 jobs for !276 with robbert/map_setoid in 5 minutes and 17 seconds (queued for 3 seconds)
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  Build
passed #130999
fp
build-coq.8.10.2

00:05:16

passed #130998
fp
build-coq.8.13.2-mr

00:04:53