SFML / SFML / 11203879471

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Use correct iterator comparison

Switching the iterator comparison used lowers the requirement for
iterators from *RandomAccessIterators* to *ForwardIterators*, which is a
benefit. It is also more accurate; instead of saying "if `begin` is less
than the end, stop." it states "if `begin` is not equal to end, stop."

Additionally, the old '<' did not protect us from undefined behavior because it is
undefined to compare two iterators relationally that are not:

1. past the end
2. within the array

6212 of 11958 branches covered (51.95%)

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