While studying the jelpi.p8 file I noticed that its using some things that aren't documented in the manual (pico-8.txt) file so I figured I'd post it here.
Missing math function:
sgn(x) returns -1, 0, or 1 based on the sign of the input value, currently passing in 0 returns 1 (maybe a bug)
Missing optional properties:
spr(n, x, y, [w, y, [flip]] the normal draw sprite function can also take the optional flip bool (not documented)
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