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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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Retention: The insulating oxide layers prevent the electrons from leaking out quickly, allowing data to persist for 10+ years under normal conditions. Over time, wear from repeated program/erase cycles (limited to ~1,000-100,000 per cell depending on type) can degrade this insulation, which is why SSDs use wear-leveling algorithms in their controllers to distribute writes evenly.

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