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57c3d74b9e
* Implement custom generic tagged union `Either` This should be more efficient than `std::variant`, while still keeping runtime safety as it `assert`s when `get`ting values. * Use `Either` for RPN expressions * Use `Either` for file stack node data * Use `Either` for `File` buffer * Use `Either` for `STRFMT` args * Use `Either` for RGBLINK symbol values * Support an equivalent of `std::monostate` for `Either` * Use `Either` for lexer tokens * Use `Either` for symbol values * Use `Either` for lexer mmap/buffer state