use switch (num) to cover more common cases and improve perf #9
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Just an idea, I don't know if there are any ramifications to this, but according to [my jsperf test](https://jsperf.com/repeat-stream-optimization) this is 58% faster for `num <= 5` 👍
jedwards1211
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Just an idea, I don't know if there are any ramifications to this, but according to my jsperf test this is 58% faster for
num <= 5👍