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navigator.bluetooth is optional -- it may be manatory by the
WebBluetooth spec, but the Rust code should still be able to handle
the errors resulting from a browser not implementing the spec at all
without panicking.
requestDevice: While it's marked optional upstream, practically it's
mandatory (the default value, an empty dictionary, is not accepted).
Contributes-To: #2381
These two don't fully resolve #2381, but the easy parts. The navigator.bluetooth part is necessary in the sense that without this, panics on unsupported browsers need manual workarounds to avoid. The latter is more of a usability thing (keeping name clutter low).