Enable symbolic shapes to be used instead of strings #22
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Description
This enables a layer of static type checking to dltyped functions based on the expression.
Notably, it catches errors in expressions statically rather than having them be errors at import time when the expression is normally parsed. We are adopting an incremental approach to this by first compiling the expression down to a parse-able expression, but in the future we may adopt these structures as the core elements of the expression parser to reduce duplication and increase expressiveness.
Addresses #21
Testing
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Test instructions
Unit tests cover all new functionality.