he/him 
Just got caught by this type cast semantic... > /[A-Za-z]/.test(undefined) === true Because it's essentially: > /[A-Za-z]/.test('undefined') === true Oh JavaScript.
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Context: I had an isAlpha function and I was passing in indexes from a string, but my index overflowed the string and so returned undefined
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That’s why we need this in
@typescriptlang:https://github.com/Microsoft/TypeScript/issues/13778 …Thanks. Twitter will use this to make your timeline better. UndoUndo
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