static JsonParser parserAt(BsonValue value) throws IOException {
    JsonParser parser = createParser(new BsonDocument("value", value));
    parser.nextToken();
    check(parser.nextFieldName()).is("value");
    parser.nextToken();
    return parser;
  }
Create parser positioned at {@code value}
criteria/mongo/test/org/immutables/criteria/mongo/bson4jackson/Parsers.java