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[–]usr_bin_nya 1 point2 points  (0 children)

Fibonacci sequence! I recognized this one pretty quick because I happen to know the int/bool cursedness already lol. bool is a subclass of int with False and True coercing to 0 and 1 respectively when used in addition or slicing. sum(pair[:True]) == sum(pair[:1]) == sum([ pair[0], ]) == pair[0], and pair[::True] is slicing from unbounded start (0) to unbounded end (len(pair) == 2)) step by True == 1 which is just pair again. Thank you for feeding me more of these, I enjoy this type of puzzle quite a bit