handle.IsClosed Checks
#289
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… protects against accessing various things after they have been disposed.
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Some previous relevant discussion: #288 (comment)
The handles in wasmtime-dotnet never seem to be made invalid, so the IsInvalid checks seem to be useless. I've added
IsClosedchecks onto all the places thatIsInvalidis used.Previously all these paths were untested, added new tests which cover these paths.