markkitti

    $ julia --lisp
    ;  _
    ; |_ _ _ |_ _ |  . _ _
    ; | (-||||_(_)|__|_)|_)
    ;-------------------|-----    ------------------------------    -----------------------
    > (+ 1 2)
    3

    # Correct, Vector is 1-based
    function mysum(v::Vector{T}) where {T <: Integer}
        s = zero(T)
        for i in 1:length(v)
            s += v[i]
        end
        return s
    end

    #Incorrect, AbstractVector is not necessarily one based
    function mysum(v::AbstractVector{T}) where {T <: Integer)
        s = zero(T)
        for i in 1:length(v)
            s += v[i]
        end
        return s
    end

    #Correct
    function mysum(v::AbstractVector{T}) where {T <: Integer)
        s = zero(T)
        for e in v
            s += e
        end
        return s
    end