Added functionality for users to pick a key function for their objects#10

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4gatepylon:master

Commits on May 9, 2020

added 'key' functionality that allows you to specify a key function that will map your input objects to something that can be filtered; this way you can easily use this data structure for your own …
18adrianoh
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deleted some debugging comments/prints and added a helpful comment in the tests file
18adrianoh
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