try a custom fuzz mutator

[folkertdev]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Flag	Coverage Δ
fuzz-compress	41.38% <ø> (-0.49%)	⬇️
fuzz-decompress	31.10% <ø> (+0.09%)	⬆️
test-aarch64-apple-darwin	89.11% <ø> (-0.03%)	⬇️
test-x86_64-apple-darwin	85.65% <ø> (-0.01%)	⬇️
test-x86_64-unknown-linux-gnu	87.07% <ø> (-0.01%)	⬇️

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see 5 files with indirect coverage changes

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