MIT rather than a dual with BSD-3. Dual licensing solves a
compatibility problem this does not have, since both are permissive and
compatible with everything, so the choice would cost a downstream reader
a decision and buy them nothing.
The debt to zstd is real and a licence is the wrong instrument for it.
No code came from libzstd; the format came from RFC 8878 and every
answer is checked against libzstd through pyzstd. That belongs in prose
where people read it.
Also drops the line calling this a feasibility spike. It has 103 tests,
an audit against the RFC, and five defects found and closed.
