Regression from JuMP 0.18 to 0.21


I am updating some functions I coded on JuMP 0.18. There I made used of the next:

solve(model, relaxation = true)

In JuMP 0.21, I could not find a way to implement it using optimize!(model).

Is there any generic way to do it?

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Please see the workarounds at Feature request: solve relaxation · Issue #1611 · jump-dev/JuMP.jl · GitHub.