1) $read($null,tn,1) makes $readn 5 here on latest version 7.76, it should make it 0 instead.

2) When you access a line number in a file that does not exist, $readn isn't set to 0 but to $lines(file):

//write -c test $+(A,$crlf,B,$crlf,C) | echo -ag > $read(test,tn,75) $readn

I think this behavior has been reported in the past, it's possible to work with it once you know but it should also make $readn 0 here.

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