Regarding the precedence of :=, at this point the only acceptable outcome for me is one where at the statement level, := and = can be used interchangeably and will have the same meaning (except probably we wouldn't allow combining both in a chained assignment). Because then we can say "and you can use assignment in expressions too, except there you must use := because = would be too easily confused with ==".
Ideally this would allow all forms of = to be replaced with :=, even extended structure unpacking (a, b, *c := foo()). -- --Guido van Rossum (python.org/~guido)
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