Expose `ExactSizeIterator` implementation of `MemoryMapIter`?

[phil-opp]

The MemoryMapIter type implements the ExactSizeIterator trait, which is useful for effectively retrieving the number of memory regions. However, this implementation is not exposed by the impl Trait-based interface, so users cannot use it. What do you think about exposing this implementation in the API?

[GabrielMajeri]

I don't see an issue with exposing this specific iterator trait, considering we know the number of segments.

[phil-opp]

Thanks a lot!