forked from Mirror/wren
2a1499b04b
hashBits() is used to generate a hash code from the same 64 bits used to represent a Wren number as a double. When building a map containing a large number of integer keys, it's important for this to do a good job scattering the bits across the 32-bit key space. Alas, it does not. Worse, the benchmark to test this happens to stop just before the performance falls off a cliff, so this was easy to overlook. This replaces it with the hash function V8 uses, which has much better performance across the numeric range.