Introduce invariant::Initialized
and migrate Maybe
to it
#853
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This opens the door to implementing
TryFromBytes<Option<&T>>
, which is currently blocked on us needing to inspect whether the referent bytes are zeroed. We couldn't do that previously, sinceAsInitialized
leaves the possibility for uninitialized bytes, which cannot be soundly checked for equality; described here: rust-lang/unsafe-code-guidelines#488.