[loukrazy]

Isn’t the point that Record classes will be able to be upgraded to value types easily once Valhalla is done? Or am I missing something

[The_rationalist]

No they won't (or maybe they will be able to be speculatively opt-deopt?) Value types above a relatively small size are less efficient than references.

[kasperni]

Yes, just add 'primitive' before record in the declaration.