[jlgreco]

How could:

  HashMap = HashTable = Map = Table = Dictionary = Hash

possibly not qualify as "obviously bad"? The only reason you've offered up is because it is easy...

[DanWaterworth]

I think this is fine. The obviously bad part is being able to remove/change constants, especially as these changes are global.

[agscala]

The obviously bad part is that you pollute the global namespace for no reason other than laziness. When someone comes across code that uses a "Table" object interchangeably with "Dictionary" and "Hash", then he's going to have to look through the source code to find this bizarre line only to find out that you renamed a built-in container for no good reason.

[DanWaterworth]

Yes, I suppose that's also true.