AiDataTypeConverters incorrectly handling multi value Contexts

We need to test this with json_as_string and yaml_as_string data types... hmmmmm...

Have you seen this happen - generally it should return an array and any time I have seen it failed its usually YAML input instead.

So if the correct is

{
  "years": [
    1998,
    1999
  ]
}

it would fail with something like this:

{
  "years": "- 1998\n- 1999"
  ]
}

I don't think that converter is a problem and when csv is returned it's great, but maybe we should call it ListCsvConverter?