> By "copy-only" I meant something you couldn't have more than one reference to: every name (variable) to which you assign the data would have its own independent copy.

That's not really a requirement of value types, no. C# has value types (structs) and you can have references to them as well (ref & out params).

In general though yes it would be typically copied around, same as an 'int' is. Particularly if Java doesn't add something equivalent to ref/out params.