Allow keeping unmapped keys #21
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Before this commit, only keys mentionned in the `Mapper` through the `map` method were treated. Other input keys were ignored. Now you can pass the option `keep_unmapped_keys` to the `normalize` method to let unmapped keys go from input to output without being touched.
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In my use case, I wanted to map some keys but keep others as is and did not want to have to map them with themselves all the time.
So I created a new option that tells the lib to keep unmapped key as is and return them in the output just as they were in the input.
Maybe it could be useful for others