Would any line produced by evaluating the <$fh> expression ever end in \r\n?
On Windows? It would require CR CR LF in the file (assuming default $/ and IO layers). Extremely unlikely.
Elsewhere? It would require CR LF in the file (assuming default $/ and IO layers). Possible.
I think s{ $/ \z }{}xms would work
Well, that should be s{ \Q$/\E \z }{}xms (and /m and /s are useless) to be equivalent to the chomp.
And if $/ hasn't been changed, s/\n\z// could be used (since $/ defaults to LF on all systems).
But if I was going with a regex pattern, I'd go with s/\s+\z//. Handles \n, \r\n and other trailing whitespace. (TSV files being an exception.)
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