Missing overload for Base.in

[jkharv]

using Symbolics 

vs = @variables x y 

vs[1] ∈ vs

This code produces the following error

ERROR: TypeError: non-boolean (Num) used in boolean context
Stacktrace:
 [1] in(x::Num, itr::Vector{Num})
   @ Base ./operators.jl:1286
 [2] top-level scope
   @ REPL[9]:1

The desired behaviour should be that this returns true if a Num is in a collection of Nums

Using the following versions:
Symbolics v5.3.1
Julia 1.9.0
Fedora Linux 38

[ChrisRackauckas]

This seems to be a reasonable suggestion.