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      Sensible. ZFS has a number of features which make little sense for Apple. How many storage pools does the typical Mac have? Just the one. At the same time, a design that expects a gigabyte or more of memory is a liability even on an entry level MacBook, to say nothing of watches. ZFS also requires quite some spare space for decent operation and a lot of people likely run their iPhones at 99%.

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        The semantics seem like a COW file system. Hopefully it’s a bit more than the equivalent of ZFS with the ARC turned off.