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The values [0, 15] represent 16 possible values, which is a power of 2.
The correct way to get an unbiased distribution from a sample of 2^x to a modulo that is not an even power of 2 is to use rejection sampling.
This is what RFC 6979 says to do https://datatracker.ietf.org/doc/html/rfc6979#section-3.2
But you can also see this technique in CSPRNG code; i.e. https://github.com/php/php-src/blob/d40726670fd2915dcd807673...
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