cql2 0.5.5

Parse, validate, and convert Common Query Language (CQL2) text and JSON
Documentation 
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{
  "op": "or",
  "args": [
    {
      "op": "isNull",
      "args": [ { "property": "value" } ]
    },
    {
      "op": "between",
      "args": [
        { "property": "value" },
        10, 20
      ]
    }
  ]
}