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Update len-metamethod-rawlen.md

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Enforce type of `__len` result
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Arseny Kapoulkine 2022-06-13 11:30:22 -07:00 • committed by GitHub
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rfcs/len-metamethod-rawlen.md
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@ -20,7 +20,7 @@ Supporting `__len` would make it possible to implement a custom integer based co
## Design
`#v` will call `__len` metamethod if the object is a table and the metamethod exists; the result of the metamethod will be returned.
`#v` will call `__len` metamethod if the object is a table and the metamethod exists; the result of the metamethod will be returned if it's a number (an error will be raised otherwise).
`table.` functions that implicitly compute table length, such as `table.getn`, `table.insert`, will continue using the actual table length. This is consistent with the
general policy that Luau doesn't support metamethods in `table.` functions.