[ntuple][RFC] Do type-check in RValue::GetRef with basic data types

[ferdymercury]

This Pull request:

Changes or fixes:

Fixes #18316

Checklist:

• tested changes locally
• updated the docs (if necessary)

[github-actions]

Test Results

    19 files      19 suites   3d 18h 32m 36s ⏱️
 2 745 tests  2 724 ✅ 0 💤 21 ❌
50 673 runs  50 640 ✅ 0 💤 33 ❌

For more details on these failures, see this check.

Results for commit d186288.

[jblomer]

I think we need to go through RField<T> for the type name check, like RField<T>::TypeName() == fField->GetTypeName(). This will still not solve the case when the fField pointer is already gone at the time we call GetRef(). While we could store the full type name string in RValue, that would be costly and I'd like to avoid it.

I think this issue needs more thought and discussion.