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SwiftPrimitive -> HexPrefixString
Convert native primitive types (such as integers, strings, or arbitrary data) to and from hex-encoded byte strings prefixed with 0x.
Problem it solves
Ethereum external interfaces exchange bytes as hex-encoded strings, creating mismatches with standard system types.
Consumes
Emits
The real projects this mechanism was found in. Attribution is the point — this is how the best teams actually do it.