func _storage_is_unique<T>(xs: [T]) -> BoolWhether this array's buffer has exactly one owner. Implicit sharing duplicates values by retain at value boundaries, so a Deinit hook runs once per copy; a hook that must act exactly once per logical value (core containers' teardown, stdlib channel endpoints) gates on the owner count of a carried buffer, and this is that gate.
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pub func _storage_is_unique<T>(xs: [T]) -> Bool {
_is_unique(ptr: xs.storage.base)
}