Add checkpoints

Author: dlfivefifty

src/bases/bases.jl

@@ -119,6 +119,9 @@ _grid(::SubBasisLayout, P) = grid(parent(P))
 _grid(::WeightedBasisLayouts, P) = grid(unweightedbasis(P))
 grid(P) = _grid(MemoryLayout(typeof(P)), P)
 
+# TODO: Move over from OrthogonalPolynomialsQuasi
+function checkpoints end
+
 struct TransformFactorization{T,Grid,Plan,IPlan} <: Factorization{T}
     grid::Grid
     plan::Plan