Odd length DCST-IV is inaccurate on WSL
While investigating !22 (merged) I eventually realised that the transforms using cos and sin from <cmath> aren't the ones with accuracy problems. It is actually the odd-length type-IV DCT and DST that are inaccurate.
From running stress.py I've seen errors as large as ~1e-4 for float which is at least 3 orders of magnitude worse than the same compiler on native linux.
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