Set.add should return a boolean if the item was added

[jmesserly]

It would be nice to add a method to the set and also check if it is there at the same time. C# HashSet.add works like this:

http://msdn.microsoft.com/en-us/library/bb353005.aspx

This saves an extra lookup. Otherwise you need to do "if (set.contains(key)) { doSomething(); } else { set.add(key); }"

We already have "set.remove" which returns a bool :)

[jmesserly]

first sentence should read "It would be nice to add an item to the set and also check if it is there at the same time."

[lrhn]

Added Duplicate label.
Marked as being merged into #3546.

[dgrove]

Removed Library-Collections label.
Added Library-Collection label.