expandspace_I should throw an error

[hyrodium]

julia> using BasicBSpline

julia> p1 = 3
3

julia> k1 = KnotVector(1:8)
KnotVector([1, 2, 3, 4, 5, 6, 7, 8])

julia> P1 = BSplineSpace{p1}(k1)
BSplineSpace{3, Int64, KnotVector{Int64}}(KnotVector([1, 2, 3, 4, 5, 6, 7, 8]))

julia> P1′ = expandspace_I(P1, KnotVector([9,19]))
BSplineSpace{3, Int64, KnotVector{Int64}}(KnotVector([1, 2, 3, 4, 5, 6, 7, 8, 9, 19]))

julia> domain(P1)
4 .. 5

julia> domain(P1′)
4 .. 7

julia> P1 ⊑ P1′
false