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Fix assertion failures in
OwnedHandle
with windows_subsystem
.
As discussed in rust-lang#88576, raw handle values in Windows can be null, such as in `windows_subsystem` mode, or when consoles are detached from a process. So, don't use `NonNull` to hold them, don't assert that they're not null, and remove `OwnedHandle`'s `repr(transparent)`. Introduce a new `HandleOrNull` type, similar to `HandleOrInvalid`, to cover the FFI use case.
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