It would be nice to have `ModelingToolkitStandardLibrary.Blocks.RealOutput()` with variable `y` instead of `u`. Can we?

[pandeysudan1]

In the library inside the module Blocks, we have RealInput() and RealOutput() causal models. Both have variables u. However, at least in control literature here in the Nordics, I have seen using u for input and y for output. It would be nice to have RealOutput() with variable y. Can we? `

[baggepinnen]

No, a lot of code relies on this and the variable name is part of the interface so changing it would be enormously breaking.