Does MATLAB have any set-like datatype?

Question

I am looking for a way to compare finite sequential data with non-deterministic ordering in MATLAB. Basically, what I want is an array, but without imposing an order on the contained elements. If I have the objects

a = [x y z];

and

b = [x z y];

I'd want isequal(a, b) to return true. With arrays, this is not the case. The easy fix would be to sort the entries before comparing them. Unfortunately, in my case the elements are complex objects which cannot easily be mapped to have an unambigious numerical relationship to each other. Another approach would be not to use isequal, but rather a custom comparison function which asserts matching lengths and then simply checks if each element from the first array is contained in the second one. However, in my case the arrays are non-trivially nested inside the structs I am trying to compare via isequal, and it would be quite complicated to write a custom comparison function for the encapsulating structs. Other than this ordering problem, the inbuilt isequal function covers all of my needs, as it correctly handles arbitrarily nested structs with arbitrary fields, so I would really like to avoid writing a complicated custom function for that.

Is there any datatype in MATLAB which allows for the described behavior? Or is there a way to easily build such a custom type? In Java, I could simply write a wrapper class with a custom implementation for the equals method, but there seems to be no such mechanism in MATLAB?