String types should provide Owned versions
Similar to OwnedValue, we need to provide owned versions for ObjectPath, Signature and Str types so that they can be used as/in return values of D-Bus methods using zbus::Proxy::call*.
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Similar to OwnedValue, we need to provide owned versions for ObjectPath, Signature and Str types so that they can be used as/in return values of D-Bus methods using zbus::Proxy::call*.