Parametric type of `Mesh` restricted to `Real`

[fhagemann]

Right now, the parametric type T of GeometryBasics.Mesh is restricted to Real:

GeometryBasics.jl/src/basic_types.jl

Lines 503 to 505 in caa6c89

	struct Mesh{
	Dim, T <: Real,
	FT <: AbstractFace,

It used to be restricted to Number initially, but this was changed in #219.
I see that it was first changed from Number to Real in b08b6f9, adding a TODO to check if it should be Number. The TODO was then finally removed in a0a6a84.

Is there any reason why T was restricted to Real?
The reason I'm asking is because I am playing around with Unitful and the current implementation does not allow for T in Mesh to be a Unitful.Quantity <: Number, for example.