0a8aa626dd refactor: Make HexStr take a span (Wladimir J. van der Laan)
Pull request description:
Make `HexSt`r take a span of bytes, instead of an awkward pair of templated iterators. This simplifies most of the uses.
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Tree-SHA512: 6e178ece5cbac62119c857a10299b1e85422938084c3f03063e17119a5129e0c28016e05a6fabaa4c271a7e0a37c7cd89fa47c435ee19b38a5acfe80d00de992