I'm not so sure I agree. Python in general is very consistent about pass-by-value versus pass-by-reference semantics, whereas MATLAB infers things in ways that are far from transparent. Look at, for instance, the way the `parfor` loop construct differentiates between "broadcast," "sliced" and other such variables, and how fragile that inference is. Maybe I haven't thought clearly enough about this particular issue, but I don't think of MATLAB as being transparent.