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This lets us encode and decode directly from the pulse vector without an intermediate transformation. This makes old streams undecodable. Additionally, ncwrs_u32() has been sped up for large N by using the sliding recurrence from Mohorko et al. ncwrs_u64 could be sped up in a similar manner, but would require a larger table of multiplicative inverses (or several 32x32->64 bit multiplies). Note that U(N,M) is now everywhere 1/2 the value it used to be.
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