[jogibear9988]

Passing some nonvector array elements by reference emits invalid IL. Use the actual vector/nonvector type to choose element opcodes versus runtime Get/Address/Set accessors. Preserve lower bounds, writable struct storage, covariance checks and ignored-read validation.

Validation

The focused regression reproduces a failure or crash on master a0950432 and passes with this change. Release solution build passes with zero warnings/errors. Both Standard and LightExpression native suites run.

Runtime	TestX passed	Legacy passed
.NET 10	367	1,756
.NET 8	367	1,755
.NET Framework 4.7.2	348	1,639

Measurements

Compare master a0950432 with this commit 3a8eb6a0. Windows ARM64, Release; .NET 8.0.28 and 10.0.9. Compilation uses prebuilt trees; invocation uses precompiled delegates and excludes expression construction/compilation. Standard and LightExpression are measured separately.

Two fresh process rounds reverse version-loading order, pin execution to one logical CPU, disable tiered compilation, warm both versions, and alternate measurement order. Values below are medians across 14 samples per side (seven per round; 30 ms calibration target).

Measured compilation and invocation allocations match master on every control. Control delegate IL matches master.

Identical-master control runs also varied: compilation -15.2% to +23.4%, invocation -21.5% to +8.9%. Timings below are observations, not a speedup or universal performance-neutrality claim. Cases that fail or produce invalid IL on master have no meaningful before/after invocation ratio; the table uses executable controls that return the expected result in both versions. Framework correctness is tested above; its performance is not measured here.

All table pairs are master → this change. B/op is allocated bytes per operation.

.NET / API	Control	Compile ns/op	Compile B/op	Invoke ns/op	Invoke B/op
10 / Light	add_control	2,488 → 2,314	872 → 872	1.89 → 1.91	0 → 0
10 / Light	multirank_read	6,642 → 6,345	2416 → 2416	2.22 → 2.23	0 → 0
10 / Light	vector_array_read	2,727 → 2,620	872 → 872	1.79 → 1.80	0 → 0
10 / Standard	add_control	2,938 → 2,960	872 → 872	1.92 → 1.94	0 → 0
10 / Standard	multirank_read	6,919 → 7,098	2416 → 2416	2.24 → 2.17	0 → 0
10 / Standard	vector_array_read	3,082 → 3,196	872 → 872	1.79 → 1.78	0 → 0
8 / Light	add_control	928 → 946	872 → 872	1.92 → 1.94	0 → 0
8 / Light	multirank_read	2,272 → 2,328	2368 → 2368	2.19 → 2.19	0 → 0
8 / Light	vector_array_read	1,010 → 994	872 → 872	1.78 → 1.85	0 → 0
8 / Standard	add_control	1,025 → 979	872 → 872	1.90 → 1.92	0 → 0
8 / Standard	multirank_read	2,360 → 2,558	2368 → 2368	2.17 → 2.20	0 → 0
8 / Standard	vector_array_read	1,199 → 1,035	872 → 872	1.84 → 1.77	0 → 0