Merge branch 'robbert/no_later_proper' into 'master'

Get rid of `later_proper'`

See merge request !82
5 jobs from master in 7 minutes 58 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #5205
fp-timing
build-coq.8.6.1

03:37

passed #5204
fp-timing
build-coq.8.7.0

03:29

passed #5203
fp-timing
build-coq.8.7.dev

02:55

 
  Deploy
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opam

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passed #5207
reverse-deps

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