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Arseny Kapoulkine 2022-02-01 20:51:02 -08:00 • committed by GitHub
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@ -73,6 +73,8 @@ end
Luau compiler already emits a bytecode instruction, FORGPREP*, to perform initial loop setup - this is where we can evaluate `__iter` as well.
Naturally, this means that if the table has `__iter` metamethod and you need to iterate through the table fields instead of using the provided metamethod, you can't rely on the general iteration scheme and need to use `pairs`. This is similar to other parts of the language, like `t[k]` vs `rawget(t, 'k')`, where the default behavior is overrideable but a library function can help peek behind the curtain.
### Default table iteration
If the argument is a table and it does not implement `__iter` metamethod, we treat this as an attempt to iterate through the table using the builtin iteration order.