he/him 
When you try to get around Flow's lack of bigint support by realiasing it to number. I feel dirty.pic.twitter.com/bbpX4t9a1r
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You should use opaque types.
Problematic since I’d have to wrap all arthimetic in a call to BigInt to coerce it to a bigint. This is entirely a hack, unfortunate there’s not a better way to do this (outside Flow supporting it itself (which I don’t have hope for unless I want to learn Ocaml and send a PR)