Write Unit Tests That Cover Every SCVal Variant the Argument Decoder Handles

[codeZe-us]

The argument decoder translates raw SCVal bytes into readable representations. Without tests, edge cases like empty args, nested maps, and large integers can silently produce wrong output.

• Write unit tests for each SCVal variant the decoder handles
• Include edge cases: empty values, max-size integers, nested SCMap inside SCVec

Expectations: The decoder has test coverage for every supported variant and all edge case tests pass.

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