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These are an order of magnitude quicker than the previous
implementations:
A relative comparison of each, measuring scanning a 1G file.
Reading 1G (1.0000000009313226GiB)
std.mem.sliceTo: 281.232ms
vectorized.sliceTo: 24.769ms
strlen: 24.291ms
std.indexOfScalar: 229.016ms
vectorized.indexOfScalar: 24.685ms
memchr: 24.958ms