Because of the way that this can be misused without the compiler knowing
(e.g. by forgetting to call `endBatchUpdates()`) it may be safer to move
it to an internal implementation detail of the class.
It could probably be done away with completely if the `notify*` methods
were moved out of the respective `*ApkInternal()` methods, but that
requires more significant refactoring to get right without code
duplication.
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