vm.cpp contains 12 ByteCode helper functions that still return FastTuple<bool, TypeTags, Value> and accept raw (TypeTags, Value) parameter pairs. These were not part of the vm_builtin*.cpp / vm_block.cpp conversion sweep (SPM-4577 Tier 2).

Candidates:

• getField (x2 overloads) — non-owning reads, could return TagValueView
• getElement — non-owning read, could return TagValueView
• getFieldOrElement — non-owning read, could return TagValueView
• getArraySize — returns shallow NumberInt64, could return TagValueOwned
• setField — creates a new object, could return TagValueMaybeOwned
• aggSum, aggCount, aggMin, aggMax, aggFirst, aggLast — accumulator helpers, could return TagValueMaybeOwned

Note: ByteCode::dispatchBuiltin in vm_builtin.cpp should remain as FastTuple — it is the intentional VM dispatch boundary between the RAII interior and the raw stack machinery.

This is a consider ticket: scope and approach should be evaluated before committing, as some of these functions have many callers across the codebase.