basilisp-lang / basilisp / #487

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Couple of small performance improvements (#552)

 * Correctly use `functools.singledispatch`. Rather than checking `isinstance()` manually and then dispatching to a secondary function via `singledispatch` (_and_ having a backup function with thousands of pointless `isinstance()` branches), I've corrected all of the relevant uses to use `singledispatch` correctly since it's capable of using the object MRO to find the most appropriate implementation.

 * Update the Keyword intern cache to just use a simple `threading.Lock` instance rather than using an Atom, since the performance is much better.

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