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Approved Issue: #2
Description
make elements behave like arguments, where numeric indexing applies to
the list your cursor is in.
Test Plan
added unit test
Pre-Review Checklist
[x] I've performed a self-review of my own code
[x] I've run the pre-commit hook to enforce code style
[x] I've added or corresponding updated tests
[x] I've run all tests and there were no failures
[x] I've updated the documentation, if applicable