I agree with the general direction of creating another module called gen_dict that adds a level of indirection instead of changing dict implementation. So developers can choose between transparency (gen_dict) and performance (dict).<div>
<br></div><div>But the truth is that Erlang lacks the proper abstractions to (elegantly) solve this problem. Even if we create a module that properly wraps gb_trees, orddict and dict, if the developer decides to create a new dictionary (for example, a red black tree based implementation) there is no way the developer will be able to hook his own dictionary into the gen_dict API. An abstraction like Clojure's protocols would be able to solve this more elegantly.</div>
<div><br></div><div>Tuple modules could be a possible solution to this problem, so one would be able to call Dict:find(Key) and not worry about what a Dict really is, but they wouldn't work for orddicts or gbtrees unless they are rewritten to be in the tuple module format and I doubt this is a direction people would like OTP libraries to move towards to (I certainly don't).</div>