Also import `Arith` in numbers to make sure it shadows (just to be sure).

6 jobs for ci/robbert/arith in 11 minutes and 23 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed build-coq.8.10.2 #68593
fp

00:04:48

passed build-coq.8.11.1 #68592
fp-timing

00:04:02

passed build-coq.8.11.dev #68591
fp

00:11:22

passed build-coq.8.7.2 #68596
fp

00:03:50

passed build-coq.8.8.2 #68595
fp

00:03:47

passed build-coq.8.9.1 #68594
fp

00:04:35