slicing a multi-dimensional `mapview`

I'd like to create a mapview of a multi-dimensional array, and then slice it with a : in one of the dimensions, but that doesn't appear to work:

julia> using FlexiMaps: mapview

julia> struct Foo{Ta, Tb}
         a::Ta
         b::Tb
       end

julia> foos = Foo.(reshape(1:10, 2, 5), reshape(range(0.0, 1.0; length=10), 2, 5))
2×5 Matrix{Foo{Int64, Float64}}:
 Foo{Int64, Float64}(1, 0.0)       Foo{Int64, Float64}(3, 0.222222)  …  Foo{Int64, Float64}(9, 0.888889)
 Foo{Int64, Float64}(2, 0.111111)  Foo{Int64, Float64}(4, 0.333333)     Foo{Int64, Float64}(10, 1.0)

julia> as = mapview(:a, foos)
2×5 FlexiMaps.MappedArray{Int64, 2, Accessors.PropertyLens{:a}, Matrix{Foo{Int64, Float64}}}:
 1  3  5  7   9
 2  4  6  8  10

julia> as[1, 2]
3

julia> as[:, 2]
ERROR: TypeError: in MappedArray, in TX, expected TX<:(AbstractMatrix), got Type{Vector{Foo{Int64, Float64}}}
Stacktrace:
 [1] (FlexiMaps.MappedArray{Int64, 2, F, TX} where {F, TX<:(AbstractMatrix)})(f::Accessors.PropertyLens{:a}, X::Vector{Foo{Int64, Float
64}})
   @ FlexiMaps ~/.julia/packages/FlexiMaps/xDulV/src/mapview.jl:5
 [2] set
   @ ~/.julia/packages/FlexiMaps/xDulV/src/mapview.jl:60 [inlined]
 [3] _getindex
   @ ~/.julia/packages/FlexiMaps/xDulV/src/mapview.jl:11 [inlined]
 [4] getindex(::FlexiMaps.MappedArray{Int64, 2, Accessors.PropertyLens{:a}, Matrix{Foo{Int64, Float64}}}, ::Function, ::Int64)
   @ FlexiMaps ~/.julia/packages/FlexiMaps/xDulV/src/mapview.jl:9
 [5] top-level scope
   @ REPL[48]:1

julia> 

A similar error occurs for a 3D array:

julia> foos2 = Foo.(reshape(1:2*3*4, 2, 3, 4), reshape(range(0.0, 1.0; length=2*3*4), 2, 3, 4))
2×3×4 Array{Foo{Int64, Float64}, 3}:
[:, :, 1] =
 Foo{Int64, Float64}(1, 0.0)        Foo{Int64, Float64}(3, 0.0869565)  Foo{Int64, Float64}(5, 0.173913)
 Foo{Int64, Float64}(2, 0.0434783)  Foo{Int64, Float64}(4, 0.130435)   Foo{Int64, Float64}(6, 0.217391)

[:, :, 2] =
 Foo{Int64, Float64}(7, 0.26087)   Foo{Int64, Float64}(9, 0.347826)   Foo{Int64, Float64}(11, 0.434783)
 Foo{Int64, Float64}(8, 0.304348)  Foo{Int64, Float64}(10, 0.391304)  Foo{Int64, Float64}(12, 0.478261)

[:, :, 3] =
 Foo{Int64, Float64}(13, 0.521739)  Foo{Int64, Float64}(15, 0.608696)  Foo{Int64, Float64}(17, 0.695652)
 Foo{Int64, Float64}(14, 0.565217)  Foo{Int64, Float64}(16, 0.652174)  Foo{Int64, Float64}(18, 0.73913)

[:, :, 4] =
 Foo{Int64, Float64}(19, 0.782609)  Foo{Int64, Float64}(21, 0.869565)  Foo{Int64, Float64}(23, 0.956522)
 Foo{Int64, Float64}(20, 0.826087)  Foo{Int64, Float64}(22, 0.913043)  Foo{Int64, Float64}(24, 1.0)

julia> as2 = mapview(:a, foos2)
2×3×4 FlexiMaps.MappedArray{Int64, 3, Accessors.PropertyLens{:a}, Array{Foo{Int64, Float64}, 3}}:
[:, :, 1] =
 1  3  5
 2  4  6

[:, :, 2] =
 7   9  11
 8  10  12

[:, :, 3] =
 13  15  17
 14  16  18

[:, :, 4] =
 19  21  23
 20  22  24

julia> as2[1, 2, 3]
15

julia> as2[:, 2, 3]
ERROR: TypeError: in MappedArray, in TX, expected TX<:(AbstractArray{<:Any, 3}), got Type{Vector{Foo{Int64, Float64}}}
Stacktrace:
 [1] (FlexiMaps.MappedArray{Int64, 3, F, TX} where {F, TX<:(AbstractArray{<:Any, 3})})(f::Accessors.PropertyLens{:a}, X::Vector{Foo{Int
64, Float64}})
   @ FlexiMaps ~/.julia/packages/FlexiMaps/xDulV/src/mapview.jl:5
 [2] set
   @ ~/.julia/packages/FlexiMaps/xDulV/src/mapview.jl:60 [inlined]
 [3] _getindex
   @ ~/.julia/packages/FlexiMaps/xDulV/src/mapview.jl:11 [inlined]
 [4] getindex(::FlexiMaps.MappedArray{Int64, 3, Accessors.PropertyLens{:a}, Array{Foo{Int64, Float64}, 3}}, ::Function, ::Int64, ::Int6
4)
   @ FlexiMaps ~/.julia/packages/FlexiMaps/xDulV/src/mapview.jl:9
 [5] top-level scope
   @ REPL[52]:1

julia> as2[2, :, 3]
ERROR: TypeError: in MappedArray, in TX, expected TX<:(AbstractArray{<:Any, 3}), got Type{Vector{Foo{Int64, Float64}}}
Stacktrace:
 [1] (FlexiMaps.MappedArray{Int64, 3, F, TX} where {F, TX<:(AbstractArray{<:Any, 3})})(f::Accessors.PropertyLens{:a}, X::Vector{Foo{Int
64, Float64}})
   @ FlexiMaps ~/.julia/packages/FlexiMaps/xDulV/src/mapview.jl:5
 [2] set
   @ ~/.julia/packages/FlexiMaps/xDulV/src/mapview.jl:60 [inlined]
 [3] _getindex
   @ ~/.julia/packages/FlexiMaps/xDulV/src/mapview.jl:11 [inlined]
 [4] getindex(::FlexiMaps.MappedArray{Int64, 3, Accessors.PropertyLens{:a}, Array{Foo{Int64, Float64}, 3}}, ::Int64, ::Function, ::Int6
4)
   @ FlexiMaps ~/.julia/packages/FlexiMaps/xDulV/src/mapview.jl:9
 [5] top-level scope
   @ REPL[53]:1

julia>