Addition of a method that will add a value to a map if the map does not already have something at key, and will also update an existing value at key.
What is the corefunc/upsert-map GitHub project? Description: "Addition of a method that will add a value to a map if the map does not already have something at key, and will also update an existing value at key.". Written in JavaScript. Explain what it does, its main use cases, key features, and who would benefit from using it.
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