Disable for...of by default, rewrite cases where it matters #12198
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for...of
introduces a dependency onSymbol
andSymbol.iterator
(and bloated code too, withtry
/catch
in a potentially very hot DEV path). We accidentally merged that in #10783.I'm adding this rule so we can be more vigilant. You can ignore it for build and other scripts but please don't ignore it in the source.