julia> tuple_of_int = (12 , 3 , 14) ## define a tuple of integers---like a readonly vector
(12, 3, 14)
julia> typeof(tuple_of_int) ## tuple_of_int holds a 1-dim tuple
Tuple{Int64,Int64,Int64}
julia> isa(tuple_of_int, Tuple) ## obvious
true
julia> isa(tuple_of_int, Tuple{Any}) ## not, this is an "int" tuple, not an "any" tuple
false
julia> isa(tuple_of_int, Tuple{Int}) ## sorry, but this would mean only one element in the tuple
false
julia> eltype(tuple_of_int) ## contents of each cell now
Int64
julia> eltype(tuple_of_int) <: Real ## Ints are a type of Real number!
true
julia> eltype(tuple_of_int) <: Int16 ## but not a type of Int16
false