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Having the ondemand binary parser exposed to a "dumb" melter was nice to be able to detect issues.
It's also nice for performance so one doesn't need to materialize all tokens if only a few are needed.
However, I'm not happy with the API. I want someone to be able to drive the parser with zero overhead but also have type safety (ie: instead of matching on constants, match on something like an enum with a catchall field). This might not be possible.
num_enum
seems nice but would come with additional overhead.