join method
Implementation
@override
StringReader join(StringReader data1, StringReader data2) => data1.length != 0
? StringReader('${data1.source}${data2.source}')
: data2;
@override
StringReader join(StringReader data1, StringReader data2) => data1.length != 0
? StringReader('${data1.source}${data2.source}')
: data2;