The setter deduplicates by equality: if the new value == the current value, no notification fires. This works well for enums, strings, and ints, but mutating a mutable object in place and reassigning the same reference won't trigger consumers (because obj == obj is trivially True). Stick to immutable values and this isn't a concern.
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The death toll is even higher in France and Spain, where many of the seabird populations that breed in the UK spend the winter, raising fears of catastrophic seabird "wreck".