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A simple ES6 map implimentation, hopefully performant, mainly for learning purposes.

Currently uses a linked list for storing the values, this is likely either very good or very bad performance wise.

For keys that are comparable by value (e.g. not objects), we use a dictionary to speed up lookup, the results for numbers when adding 10,000 values and when addding 100 values. In other words there is some overhead but it pays for itself.