Nah. a[insert method call punctuation here]set_b(foo)
is just nasty. If it's supposed to be an assignment it should look
like an assignment, and setting a property or attribute is an assignment no matter how it's mediated under the hood.
One of the few places (well, OK, the only place so far, but I won't rule out others existing) that I like lvalue methods or subs.
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