n[1:end] doesn't work for matrices with Symbol names

[knuesel]

Here's an example:

julia> a = [1 3; 2 4];

julia> a[1:end]
4-element Vector{Int64}:
 1
 2
 3
 4

julia> n = NamedArray(a, ([:a, :b], [:c, :d]));

julia> n[1:end]
ERROR: MethodError: Cannot `convert` an object of type String to an object of type Symbol

Stacktrace

Stacktrace:
 [1] convert
   @ ~/.julia/packages/OrderedCollections/vTcqn/src/ordered_dict.jl:106 [inlined]
 [2] setindex!
   @ ./array.jl:969 [inlined]
 [3] similar(n::NamedMatrix{Int64, Matrix{Int64}, Tuple{OrderedCollections.OrderedDict{Symbol, Int64}, OrderedCollections.OrderedDict{Symbol, Int64}}}, t::Type, dims::Tuple{Int64})
   @ NamedArrays ~/.julia/packages/NamedArrays/spYk1/src/base.jl:45
 [4] similar
   @ ./abstractarray.jl:836 [inlined]
 [5] _unsafe_getindex
   @ ./multidimensional.jl:873 [inlined]
 [6] _getindex
   @ ./multidimensional.jl:861 [inlined]
 [7] getindex(A::NamedMatrix{Int64, Matrix{Int64}, Tuple{OrderedCollections.OrderedDict{Symbol, Int64}, OrderedCollections.OrderedDict{Symbol, Int64}}}, I::UnitRange{Int64})
   @ Base ./abstractarray.jl:1294
 [8] top-level scope
   @ REPL[5]:1

[davidavdav]

Thanks for finding this bug, for some reason it has to do with the type of the names being Symbol, which seems to be an edge case of some sort.