Thanks for mentioning this.
Reading the thread you linked to, adrianh commented "Once you start refactoring classes and moving object fields between classes, adding fields to classes, etc. I find array based objects becomes a complete PITA." and you seem to agree with him. So, I am reading your example as a way to do things very cleanly in some simple cases, but not as a replacement for fields, which, despite its annoyances, does play well with inheritance.
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