Some functions in Phobos take an element for a separator whereas others take a range. For instance, splitter takes an element, but its opposite - joiner - takes a range. findSplit* take a range and split on that (though they don't technically take a seperator per se) but until takes an element. I keep having to look up functions to know whether the separator they take is a single element or a range of them. I would think that it would behoove us to make the functions in Phobos which take separators _consistent_ and make them all take a range for their separator rather than having some take a range and some take a single element. It would definitely improve useability. And if it's a problem to have them all take a range for their separator, then maybe they should have two versions - one which takes an element for the separator and one which takes a range.
See also bug 4468
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