[Nonlinear] lazily build ::Expr representaton of subexpressions #1984
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The main benefit of this is that modifying a parameter no longer needs a call to initialize to reconstruct the expressions.
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Project: next-gen nonlinear support
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The main benefit of this is that modifying a parameter no longer
needs a call to initialize to reconstruct the expressions.
This fix is needed for jump-dev/JuMP.jl#3018 (comment).
x-ref jump-dev/JuMP.jl#1185
x-ref jump-dev/Ipopt.jl#321