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Document `PartialEq` impl for `OnceLock` Adds documentation to `std::sync::OnceLock`'s `PartialEq` implementation: specifies publicly that `OnceLock`s are compared based on their contents, and nothing else. Created in response to, but not directly related to, https://github.com/rust-lang/rust/issues/131959. ## ne This doesn't create and document `PartialEq::ne`. There's precedent for this in [`RefCell`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#impl-PartialEq-for-RefCell%3CT%3E).