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Add semantics for indexing into arrays with negative indices 2 of 2 checklist items completed!297
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Refactor `Index`, etc. into `Select`, `Range`, and `Index` 2 of 3 checklist items completed!302
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[WIP] Add arithmetic sub-expressions to Ion's syntax 2 of 2 checklist items completed!327
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Shell::readln now completes to a filename if the last word is a file 2 of 2 checklist items completed!342