How to detect forms of tuples

General Usage
1

How best to detect if a passed-in tuple is

(a1, a2)

or

((a1, a2), (b1, b2))
2 
julia> ((1, 2), ("foo", :bar)) isa Tuple{Tuple{Any,Any}, Tuple{Any,Any}}
true
3

Thanks for the response.

I hope being able to detect (a1, a2) because the tuple of tuples is variable length.

But this dones’t work:

julia> (1,2) isa Tuple{Any,Any}
true

julia> ((1,2), (2,3)) isa Tuple{Any,Any}
true
4 
julia> detect(v::Tuple{Any,Any}) = !(v[1] isa Tuple && v[2] isa Tuple)
detect (generic function with 1 method)

julia> detect(v) = false
detect (generic function with 2 methods)

julia> detect((1, 2))
true

julia> detect(((1, 2), (3, 4)))
false