More accurate check for cache-hit in memoize3 #1207
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`WeakMap.get` returns `undefined` on cache miss. Checking for false instead of `undefined` will give a false cache-miss and recalculate when a false value is returned by the memoised function.
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WeakMap.getreturnsundefinedon cache miss. Checking for false instead ofundefinedcould give a false cache-miss and recalculate when a false value is returned by the memoised function with those params.