Hi, I’d like to consider a symbolic variable as a constant from Convex.

For example,

```
julia> using Symbolics
julia> using Convex
julia> @variables x
1-element Vector{Num}:
x
julia> u = Convex.Variable(1)
Variable
size: (1, 1)
sign: real
vexity: affine
id: 120…439
julia> x + u
ERROR: TypeError: non-boolean (Num) used in boolean context
Stacktrace:
[1] _sign
@ ~/.julia/packages/Convex/ukggP/src/constant.jl:17 [inlined]
[2] Constant (repeats 2 times)
@ ~/.julia/packages/Convex/ukggP/src/constant.jl:37 [inlined]
[3] +(x::Num, y::Convex.Variable)
@ Convex ~/.julia/packages/Convex/ukggP/src/atoms/affine/add_subtract.jl:117
[4] top-level scope
@ REPL[4]:1
[5] top-level scope
@ ~/.julia/packages/Infiltrator/r3Hf5/src/Infiltrator.jl:710
julia> Convex.Constant(x)
ERROR: TypeError: non-boolean (Num) used in boolean context
Stacktrace:
[1] _sign
@ ~/.julia/packages/Convex/ukggP/src/constant.jl:17 [inlined]
[2] Constant (repeats 2 times)
@ ~/.julia/packages/Convex/ukggP/src/constant.jl:37 [inlined]
[3] top-level scope
@ REPL[5]:1
[4] top-level scope
@ ~/.julia/packages/Infiltrator/r3Hf5/src/Infiltrator.jl:710
```

Is there any way to do this?