I found these:

https://github.com/ghc/ghc/blob/5f3c5384df59717ca8013c5df8d1f65692867825/includes/rts/Constants.h#L194

They go only 0-14, so there's some long chains of branches and stuff in hot paths that could be cleaned up into single &-masked branches by changing these into a set of flags.

And then I saw these:

Where does 16 and 17 come from -- I couldn't find them in the header files anywhere?

Kyle