Parametric type of `Mesh` restricted to `Real`

Right now, the parametric type T of GeometryBasics.Mesh is restricted to Real:
https://github.com/JuliaGeometry/GeometryBasics.jl/blob/caa6c89f9dabe2512fb1ab8095d75aff9f9e4ea3/src/basic_types.jl#L503-L505

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 https://github.com/JuliaGeometry/GeometryBasics.jl/pull/219/commits/b08b6f9179c02e6406757cf3cf4984e1b2514d7b, adding a TODO to check if it should be Number. The TODO was then finally removed in https://github.com/JuliaGeometry/GeometryBasics.jl/pull/219/commits/a0a6a84c4e75ffab5ed2070568465bd1aa9c6bc0.

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.

Start with src/basic_types.jl at the Mesh definition and review the linked #219 changes that restricted its parametric type from Number to Real. Investigate whether Unitful.Quantity should be accepted and what consequences that has for Mesh; done requires a decided compatibility direction and corresponding validation.