buildPath() and absolute paths

[Lars T. Kyllingstad]

Currently, std.path.buildPath() is designed so that if one of the path 
segments is rooted, then the preceding segments are simply dropped. 
That is,

    assert(buildPath("foo", "bar", "/baz") == "/baz");

The only reason I wrote it like this is that this was how the old (now 
deprecated and removed) join() function was designed, and buildPath() 
was supposed to be a drop-in replacement.

I have come to think this design sucks, and I want to fix it.  I cannot 
think of a single use case for it.  I have a new implementation of this 
function in the pipeline, so now seems like a good time.  Would anyone 
be opposed to me rewriting it so that it throws an exception when any 
path segment but the first is rooted?

Lars