isa(x,Number)

[sswatson]

It seems undesirable that a variable of type SymEngine.Basic is a Number but throws an error when coerced to that type. The type SymPy.Sym does not have this issue.

julia> using SymEngine
julia> @vars x

julia> isa(x,Number)
true

julia> Number[1,2,3,x]
ERROR: ArgumentError: Object can have no free symbols
 in N(::SymEngine.BasicType{Val{:Symbol}}) at /Users/sswatson/.julia/v0.5/SymEngine/src/numerics.jl:122
 in setindex!(::Array{Number,1}, ::SymEngine.Basic, ::Int64) at ./array.jl:415
 in getindex(::Type{Number}, ::Int64, ::Int64, ::Int64, ::SymEngine.Basic, ::Vararg{SymEngine.Basic,N}) at ./array.jl:132

julia> using SymPy; @syms y
(y,)

julia> Number[1,2,3,y]
4-element Array{Number,1}:
 1
 2
 3
 y

[ChrisRackauckas]

Yeah, that's peculiar. I never noticed this. It should definitely be allowed in an array of numbers.

[isuruf]

Fix in #83. Added the example here as a testcase.