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We'd need to ensure we have we have an internal variant of numbers' `tostring` (described earlier) implementation which exposes those formatting options to `strnig.format`. Maybe this would be the `__tostring` metamethod?
Sometimes pointers would be need to be cast to numbers for formatting.

Regardless we'd gather plenty of substrings to hand off to our CONCAT opcode!

4/4 Fin for today! Tomorrow: UTF-8!

(type-casting could be the main util we need to implement Lua's standard lib in Lua...)