Merge branch 'robbert/nat_cancel' into 'master'

A simple type class based canceler for natural numbers.

See merge request robbertkrebbers/coq-stdpp!26
6 jobs for master in 10 minutes and 18 seconds (queued for 1 minute and 54 seconds)
Status Job ID Name Coverage
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  Deploy
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  Build More
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passed build-coq.8.7.dev #8136
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