Mixing non-scalar parameters and Bloch phases about quantica.jl HOT 1 CLOSED

Attempting to generalize Mesh to accept arbitrary tuples instead of SVectors (to assess all possibilities for completeness), I've encountered a plethora of places where the assumption that mesh vertices are vectors is deeply ingrained. This has convinced me to simply draw the line at the buildmesh level. We can still call bloch(ph, (params..., ϕs...) with non-numeric params (the full tuple is not converted to an SVector, only the ϕs part). In fact, thinking about it a bit more, it turns out that our new lift approach for bandstructure provides a perfect way to combine non-scalar parameters with Meshes that have purely SVector{D,<:Number} vertices: just write an appropriate lift that converts the vertex to the non-scalar parameter.

The actionable part of this issue is then simple: constrain the eltype of Mesh vertices to be Numbers, and perhaps throw an informative error in case one tries to define a MeshSpec with non-scalar vertices.

from quantica.jl.