x-ref https://github.com/jump-dev/JuMP.jl/issues/3738 ``` f(x) == b <--> {f(x) - b} ⟂ y f(x) >= b <--> {f(x) - b} ⟂ y >= 0 f(x) <= b <--> {f(x) - b} ⟂ y <= 0 ```