Return a transformed string literal from ARM transformation functions invoked with arguments that are all string literals #6765
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Resolves #4134
This PR uses the ARM Expressions library to derive literal return types for ARM functions when invoked with arguments that are themselves all literal types. At present, this is only possible for ARM functions that take one or more string arguments and return a single string, but the pattern could be applied to other deterministic ARM function signatures if Bicep adds literal specializations for other primitive types.
Contributing a feature
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