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When making pin-init its own crate, `Zeroable` will no longer be defined by the kernel crate and thus implementing it for `Option<Box<T, A>>` is no longer possible due to the orphan rule. For this reason introduce a new `ZeroableOption` trait that circumvents this problem. Signed-off-by: Benno Lossin <benno.lossin@proton.me> Reviewed-by: Fiona Behrens <me@kloenk.dev> Reviewed-by: Andreas Hindborg <a.hindborg@kernel.org> Tested-by: Andreas Hindborg <a.hindborg@kernel.org> Link: https://lore.kernel.org/r/20250308110339.2997091-11-benno.lossin@proton.me Signed-off-by: Miguel Ojeda <ojeda@kernel.org>