Clean up dedupe to better match other entrypoints #360
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Cleans up the code for the 'dedupe' variant to better match the code-style of the other entrypoints. This removes the immediately invoked function expression that was used to prevent variables from leaking into the global scope, as this is no longer possible now that this code is contained in a module.
This also sorts some methods and renames some variables, but otherwise doesn't touch the code, leading to similar performance to what we had before.