nil pointer is also considered an empty map. #2
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I found it awkward to have to do New*Map before actually using them. With these pretty small changes you can just e.g. var m FooBarMap and play with it directly.
Similar changes to vectors/sets would be nice too, but I did not need them and due to performance reasons I think I am refactoring my design away from this; golang gc is stupidly expensive so these datastructures wind up being much slower than I thought. Live and learn :-)