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bytestring
An efficient compact, immutable byte string type (both strict and lazy) suitable for binary or 8-bit character data.
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The documentation is itself fairly funny, for those who don’t care to click ahead:
> This "function" has a superficial similarity to ‘unsafePerformIO’ but it is in fact a malevolent agent of chaos. It unpicks the seams of reality (and the IO monad) so that the normal rules no longer apply. It lulls you into thinking it is reasonable, but when you are not looking it stabs you in the back and aliases all of your mutable buffers. The carcass of many a seasoned Haskell programmer lie strewn at its feet.
> Witness the trail of destruction:
https://github.com/haskell/bytestring/commit/71c4b438c675aa360c79d79acc9a491e7bbc26e7