fix: fix undefined behavior with mutable references #583
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ensures we only count references in an array when the value is mutable. Also accounts for state values
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Currently TEALScript has undefined behavior with mutable references. The two sceanrios that result in UB are
const) references to mutable objectsThis PR adds a reference checker to ensure those scenarios do not occur. The only material change for developers is the need to add a
clonehere or there, but as seen in this PR it is not needed in many cases.ab0d526 was the initial reference checking implementation which used the architecture of TEALScript to check problematic areas
702e43b is (the start of) an implementation-agnostic reference checker that works solely on the TypeScript AST. This means the work here should be applicable to both TEALScript and Puya TS.