[BUG] `DiagonalArrays.diagview(a::ITensor)` broken

[mtfishman]

julia> using ITensorBase: Index

julia> using DiagonalArrays: diagview

julia> i, j = Index.((2, 2))
(Index(length=2|id=104), Index(length=2|id=166))

julia> a = randn(i, j)
named(2, Index(length=2|id=104))×named(2, Index(length=2|id=166)) ITensor with indices named(Base.OneTo(2), Index(length=2|id=104))×named(Base.OneTo(2), Index(length=2|id=166))
2×2 Matrix{Float64}:
  1.44795  0.55187
 -2.36249  0.553122

julia> diagview(a)
ERROR: MethodError: no method matching LinearIndices(::NamedDimsArrays.NaiveOrderedSet{Tuple{NamedDimsArrays.NamedUnitRange{…}, NamedDimsArrays.NamedUnitRange{…}}})
The type `LinearIndices` exists, but no method is defined for this combination of argument types when trying to construct it.

Closest candidates are:
  LinearIndices(::Tuple{})
   @ Base indices.jl:489
  LinearIndices(::Base.Broadcast.Broadcasted{<:Any, <:Tuple{Any}})
   @ Base broadcast.jl:257
  LinearIndices(::CartesianIndices{N, R}) where {N, R<:NTuple{N, AbstractUnitRange}}
   @ Base multidimensional.jl:581
  ...

Stacktrace:
 [1] LinearIndices(A::ITensor)
   @ Base ./indices.jl:494
 [2] diagindices(::IndexLinear, a::ITensor)
   @ DiagonalArrays ~/.julia/packages/DiagonalArrays/Nf92r/src/diaginterface/diaginterface.jl:53
 [3] diagindices(a::ITensor)
   @ DiagonalArrays ~/.julia/packages/DiagonalArrays/Nf92r/src/diaginterface/diaginterface.jl:50
 [4] diagview(a::ITensor)
   @ DiagonalArrays ~/.julia/packages/DiagonalArrays/Nf92r/src/diaginterface/diaginterface.jl:69
 [5] top-level scope
   @ REPL[11]:1
Some type information was truncated. Use `show(err)` to see complete types.

Probably this issue originates in NamedDimsArrays.jl and/or DiagonalArrays.jl and if so should be fixed there.