To me it seems that axes works for tuples.
julia> a = (1,2,3,4,'a')
(1, 2, 3, 4, 'a')
julia> typeof(a)
Tuple{Int64, Int64, Int64, Int64, Char}
julia> axes(a)
(Base.OneTo(5),)
julia> @which axes(a)
axes(t::Tuple) in Base at tuple.jl:28
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