one of two (nullable and non-nullable) type representations non-initialized

[Khatskevich]

local schema = [[ [ {
"name": "Foo",
"type": "record",
"fields": [
{"name": "foo", "type" :"float"} ] } ] ]]
schema = json.decode(schema)
ok, handle = avro.create(schema)

error

<union>/<branch-1>: Union may not immediately contain other unions