WARN The Kafka Connect schema name Value is not a valid Avro schema name, so replacing with io.debezium.connector.mysql.MySqlSchema

Hi,
we see in the Kafka Connetcor log the following:
WARN The Kafka Connect schema name Value is not a valid Avro schema name, so replacing with io.debezium.connector.mysql.MySqlSchema

Is it Avro name naming convention ?
In your code I see this :

• <li>The name portion of a fullname, record field names, and enum symbols must start with a Latin letter or underscore
• character (e.g., [A-Z,a-z,_]); and subsequent characters must be Latin alphanumeric or the underscore ( {@code _}

  )

• characters (e.g., [A-Z,a-z,0-9,_]).</li>

but the "-" is also supported ?
Where do we can see in : http://avro.apache.org/docs/current/spec.html that the "-" i snor supported and transform into "_" (underscore) ?

regards,
Eric