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Make the API of the new helpers more similar to the old wrapper.
In particular we now return the hash as a byte string to avoid
any endianness problems.
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All our hash functions are based on siphash24(), factor out
siphash_init() and siphash24_finalize() and pass the siphash
state to the hash functions rather than the hash key.
This simplifies the hash functions, and in particular makes
composition simpler as calling siphash24_compress() repeatedly
on separate chunks of input has the same effect as first
concatenating the input and then calling siphash23_compress()
on the result.
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SipHash appears to be the new gold standard for hashing smaller strings
for hashtables these days, so let's make use of it.
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each invocation
We can determine the list entry type via the typeof() gcc construct, and
so we should to make the macros much shorter to use.
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I'm assuming that it's fine if a _const_ or _pure_ function
calls assert. It is assumed that the assert won't trigger,
and even if it does, it can only trigger on the first call
with a given set of parameters, and we don't care if the
compiler moves the order of calls.
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