I have reviewed this patch and it still applies to master, compiles and
passes the test suite.
I like the goal of the patch, making use of the already existing
abbreviation machinery in more cases is something we should do and the
patch itself looks clean.
I can also confirm the roughly 25% speedup in the best case (numerics
which are all distinct) with no measurable slowdown in the worst case.
Given this speedup and the small size of the patch I think we should
apply it. I will set this patch to "Ready for Commiter".
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