v[Block(1,2)] should error

[dlfivefifty]

This should throw an error:

julia> v = BlockArray(randn(3),1:2)
2-blocked 3-element BlockVector{Float64, Vector{Vector{Float64}}, Tuple{BlockedUnitRange{ArrayLayouts.RangeCumsum{Int64, UnitRange{Int64}}}}}:
 -0.5110413514378647
 ───────────────────
  0.5939308866063546
 -0.9983642145180261

julia> v[Block(1,2)]
1×1-blocked 1×1 BlockMatrix{Float64, Matrix{Matrix{Float64}}, Tuple{Base.OneTo{Int64}, Base.OneTo{Int64}}}:
 -0.5110413514378647

Probably missing a blockboundscheck in the view implementation.