Summary

• add fixed-array unmarshal coverage for the recent TypedArray[int8] path in interp/marshal.go
• verify byte and int8 array decoding from types.TypedArray[int8]
• verify fixed-array length mismatches return ErrValueOverflow

Changed Paths Tested

• interp/marshal.go: unmarshalArray fast path for TypedArray[int8] into [N]byte and [N]int8

Added Tests

• TestInterpreter_Unmarshal/array in interp/interp_test.go
  • [3]byte decodes 0x00, 0x7F, -1 as 0x00, 0x7F, 0xFF
  • [2]int8 preserves signed bytes
  • mismatched fixed-array length returns ErrValueOverflow

Validation

• go test ./interp -run TestInterpreter_Unmarshal

Skipped Targets

• interp/marshal.go slice fast path: already covered by existing []byte and []int8 unmarshal tests in TestInterpreter_Unmarshal/slice
• broader typed-array interpreter ops: already covered by the i8 opcode tests added with the feature commit in TestInterpreter_Run