What is the rationale for Vec::peek_mut ?

It seems to me that last_mut( available via Deref trait) has the same functionality ( it returns a mut ref to the last element, or None if the Vec is empty ).

What am I missing?

[ Well it actually returns a PeekMut struct, I guess it has something to do with that, and the pop method in that, but I am still having trouble seeing why it is useful ]

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