[primitives] XxxStack questions

[Rodney Waldhoff]

I've been doing a little clean-up of commons-primitives in order to move 
toward a 1.1 (or better) release.

I notice that back in April several Stack implementations were introduced, 
with names like FloatStack and IntStack, etc.

I wonder if:
1) in keeping with the XxxList implementations, if XxxStack should in fact 
be an interface, rather than a concrete class

2) we might be able to get away with simply adding the stack methods 
(push/peek/pop) to the XxxList interfaces, and providing adapters to and 
from the Object based Stack, as necessary.

3) we should make XxxStack descend from XxxCollection, at minimum
Any thoughts?
- Rod
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