Memory management: stop copying data!

[tBuLi]

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Description

Currently, when creating a new MV instance, we usually copy data around. For example, when initiating from a numpy array, turning this array into the mapping vals means that copies of the data are created. A possible solution to this is to store the input array as vals directly, and to turn the MV into a Mapping using collections.abc. This way we could convert from the binary key to the proper location in the input sequence and retrieve it when needed. This way no data is copied anymore, and performance should improve accordingly.