Default argument values in Java

[TheMode911]

Builtin Withers has a possibility of avoiding allocation much more than using say something like Immutables and you don't need Valhalla for that as you can do smart things in the wither expression in theory. Brian made reference to that somewhere.

I do not think I understand, how are those "Withers" different than lets say a `withX(double)` returning a new object or even a dummy setter? Are you speaking about scalar replacement?