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Michele Tartara authored
Using None in a VTYPE_MAYBE_STRING is wrong, because it cannot really be serialized to a Haskel Nothing, but given that this can (and does) influence external components already using None, it is turned to a warning in order not to break the existing behavior. Signed-off-by: Michele Tartara <mtartara@google.com> Reviewed-by: Helga Velroyen <helgav@google.com>
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