Rc2.0 arrays

[cliffckerr]

Description

Creates BaseArr class, used for Arr, Result, etc.

Last of the major v2.0 changes!

Checklist

• [ ] Code commented & docstrings added
• [ ] New tests were needed and have been added
• [ ] A new version number was needed & changelog has been updated
• [ ] A new PyPI version needs to be released