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
Changes: * api: add() and del() compat fixes * add() returns the value being added if subject is not nil * del() returns the value removed, if found in the table (implies subject is not nil) * api: atan2 returns are [0,1[ instead of ]-π,π] * api: atan2 returns are offset by -1/4 circle * atan2(0,0) = 0.75 * function behavior now matches pico8 on wiki example code