Safer handling of DeviceType value coming from FFI #90
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…ly bounds check it to prevent undefined behaviour
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Superseeds #85 as the root cause turned out to be invalid device_type value coming from a C plugin causing undefined behaviour.
Seemingly in general it's risky to take enums from C straight up into Rust, as funky things happen (undefined behaviour) when invalid enum values come in from the C side (Some talk on this here: https://users.rust-lang.org/t/guarding-against-invalid-enum-values-arriving-via-ffi/33482)