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The function is declared in pg_proc.dat a bigint as its second input argument, but the function's code used PG_GETARG_INT32(). This is an issue in 32-bit architectures in stable branches (up to v18) where bigint is still passed by reference, reporting bogus numbers. Since2a600a93c7(v19 and HEAD), this is less of a problem as Datums became 8-byte wide everywhere. Oversight inab0dfc961b. Author: Markos Fountoulakis <markos@planetscale.com> Reviewed-by: Chao Li <li.evan.chao@gmail.com> Discussion: https://postgr.es/m/e791bbb7-af3a-4a91-a5bb-c744e5c3ef54@planetscale.com Backpatch-through: 14