[cmalinmayor]

Proposed Change

Let user pass in multiple metadata models, and combine them in a discriminative union

Checklist

Go through these things before merge. Actions should run automatically to test them, but for information on how to run locally, see CONTRIBUTING.md.

• I have added tests that prove that my feature works in various situations or tests the bugfix (if applicable).
• I have checked that the tests pass and I maintained or improved test coverage (just test-cov).
• I have written docstrings for any new public functions and classes.
• I have checked that linting and formatting pass (just lint).
• I have checked that mypy type checking passes (just typecheck).

Further Comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...