Fix bugs which did not allow array variables to share memory #1007
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Description
Existing code had a bug where you could not create list variables which shared memory space. For example a list of 32 - 16 bit values in the lower 16-bits of each 32-bit memory location, co-located with a list of 32 - 16 bit values in the upper 16-bit of each 32-bit memory location.
This PR fixes this error and also cleans up some of the code related to mapping bytes.
Known Issue discovered after v6.3.0 release