It is sometimes desirable to get the forward index of an element but searching from the end of a bidirectionally iterable collection. For example, consider finding the string suffix following the last period.
This is similar to C++'s `find_last_of` or Python's `rindex`.
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@natecook1000 The docs now say there is a `firstIndex` and a `lastIndex` but no `index`. Yet there is no compile error when using `index`. Shouldn't this be a warning at least? We should all be migrating to `firstIndex` but nothing calls out the change. I've been using Swift 4.2 since WWDC and I only just noticed this by accident.