Initialize iterator index to 0. - #71
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Without this, in JavaScript `next()` will return null the first time, because `_filtered[null] == null`. This typically indicates that iteration should stop, so it doesn't even matter that subsequent values are returned correctly.
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Without this, in JavaScript
next()will return null the first time, because_filtered[null] == null. This typically indicates that iteration should stop, so it doesn't even matter that subsequent values are returned correctly.