private static Value[] toValues(String valueListString) {
        String[] valueStrings = valueListString.split(",");
        Value[] values = new Value[valueStrings.length];
        for (int i=0; i<valueStrings.length; i++) {
            try {
                values[i] = Value.parse(valueStrings[i]);
            }
            catch (NumberFormatException e) { // allow un(double)quoted string values in Gbdt XML trees
                values[i] = new StringValue(valueStrings[i]);
            }
        }
        return values;
    }
Converts one or more comma-separated values into an array of values
searchlib/src/main/java/com/yahoo/searchlib/gbdt/FeatureNode.java