Daniel Podolsky
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Daniel Podolsky
https://golang.org/pkg/io/#Copy _A successful Copy returns err == nil, not err == EOF. Because Copy is defined to read from src until EOF, it does not treat an EOF from Read...
I was wrong in the private discussion we had: not `!.` but `?.` http://groovy-lang.org/operators.html#_safe_navigation_operator
I've used this in my Java days. finally I found it is more convenience to have clear methods name