Fdawgs / node-poppler / 14824146912 / 2

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perf(index): use `for` loop over `for...of` loop (#639)

`for...of` [has an iterator overhead](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of#description).

A traditional loop is faster because there are no intermediate objects created or function calls during iteration.
With the length being cached, there are no property lookups either.

See https://github.com/kibertoad/nodejs-benchmark-tournament for supporting benchmarking.

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