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(#76) - correctly iterate when destroying

The previous loop logic was incorrect, because it
was destroying the `keys` array as it iterated. The
proper way to delete elements in an array by index
is to iterate backwards, so you don't destroy the
array while you're looping.

The new test fails before the fix but succeeds after.

3 of 3 new or added lines in 1 file covered. (100.0%)

280 of 325 relevant lines covered (86.15%)

650.77 hits per line