In the exception code a foo.eof() check need to be in foo.read(). So I guess the runtime in theory should be the same and the implementation happened to be slo

In the exception code a foo.eof() check need to be in foo.read(). So I guess the runtime in theory should be the same and the implementation happened to be slow. Maybe eol() did some syscall each time instead of caching a EOF int like in C.