"isDroppable" range trait for slicing to end

[monarch_dodra]

On Monday, 29 October 2012 at 14:34:04 UTC, monarch_dodra wrote:
> [SNIP]

I have a preliminary Pull Request to illustrate my point here:
https://github.com/D-Programming-Language/phobos/pull/908

Currently, I only added popFrontN on the ranges on which it is 
most obvious, you should get the point.

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I'm very sorry if I'm not very clear. Explaining thingsby writing 
is not my strong suit. What would you think of this proposal?