I looked through the JIRA tickets but I did not find one that matched
what I just ran into - unions can't have multiple maps, even if each one
has a different value type?  Automatic-map-generation is the last feature
I'm adding to AVRO-457 <https://issues.apache.org/jira/browse/AVRO-457> (before
Avro -> XML conversion) and I was surprised that two maps, each with
different value types, could not co-exist in a union.  Is this on purpose?


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