Your quoting is broken. You are doing
>perl -le"print length unpack 'A', \'n';"
1
which is the same as
>perl -le"print length unpack 'A', 'S';"
1
If you fix the quoting, you get the correct result.
>perl -le"print length unpack 'A', qq{\n};"
0
pack says "When unpacking, «A» strips trailing whitespace and nulls".
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