Incorrect changebasis_I

[hyrodium]

julia> using BasicBSpline

julia> P = BSplineSpace{4, Int64, KnotVector{Int64}}(KnotVector([1, 1, 2, 2, 2, 3, 3, 4, 4, 5, 7]))
BSplineSpace{4, Int64, KnotVector{Int64}}(KnotVector([1, 1, 2, 2, 2, 3, 3, 4, 4, 5, 7]))

julia> P′ = BSplineSpace{5, Int64, KnotVector{Int64}}(KnotVector([1, 1, 1, 1, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 5, 6]))
BSplineSpace{5, Int64, KnotVector{Int64}}(KnotVector([1, 1, 1, 1, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 5, 6]))

julia> changebasis_I(P, P′)
6×10 SparseArrays.SparseMatrixCSC{Float64, Int32} with 27 stored entries:
   ⋅    2.8   0.4    ⋅    ⋅    ⋅     ⋅     ⋅     ⋅     ⋅ 
   ⋅   -4.4   2.0   0.8   ⋅    ⋅     ⋅     ⋅     ⋅     ⋅ 
  2.8   2.8  -1.6   0.4  0.8  0.45  0.05  0.05  0.05  0.05
 -0.2  -0.2   0.2  -0.2  0.2  0.5   0.5   0.5   0.5   0.5
   ⋅     ⋅     ⋅     ⋅    ⋅   0.05  0.45   ⋅     ⋅     ⋅ 
   ⋅     ⋅     ⋅     ⋅    ⋅    ⋅     ⋅     ⋅     ⋅     ⋅