[core] make static vars constexpr for thread safety v3 #18757
Merged
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Fixes #18751
Please squash.
All credit goes to vepadulano and guitargeek
Alternatives to #18753 and #18756
Of course, I could also make a version 4 which just does
lengths {5,5,8}which is even more compact :) and this array did not change in 22 years, so...