Incorrect type assert triggers when calling dropdims with a StaticArray

[mroavi]

Minimal example:

julia> using StaticArrays
julia> arr = @MMatrix rand(Int64,4,1)
4×1 MMatrix{4, 1, Int64, 4} with indices SOneTo(4)×SOneTo(1):
 -1142656121258989149
   636254653156898121
 -4641314833637010406
  -842100514524024656
julia> dropdims(arr, dims=2)
ERROR: TypeError: in typeassert, expected Tuple{SOneTo{1}}, got a value of type Tuple{SOneTo{4}}
Stacktrace:
 [1] _dropdims(A::MMatrix{4, 1, Int64, 4}, dims::Tuple{Int64})
   @ Base ./abstractarraymath.jl:85
 [2] _dropdims(A::MMatrix{4, 1, Int64, 4}, dim::Int64)
   @ Base ./abstractarraymath.jl:87
 [3] dropdims(A::MMatrix{4, 1, Int64, 4}; dims::Int64)
   @ Base ./abstractarraymath.jl:70
 [4] top-level scope
   @ REPL[3]:1

Jakob Nybo Nissen on Slack:

It looks to me like Base's function is wrong - please make an issue!
Specifically, what happens is that the typeassert in reshape(A, d::typeof(_sub(axes(A), dims))) is not right - it picks up the wrong axes. It works by accident for Base arrays since all axes of Base arrays have the same type

[mroavi]

Moved to Julia Base JuliaLang/julia#40462