it should be silently truncated.
no warnings qw( pack );
More to the point, I think unicode should be explicitly enabled by those that need it
You're getting an overflow warning. It has nothing to do with Unicode. In fact, pack and unpack don't use Unicode at all.*
* — Not even "U" has any understanding of Unicode.
>perl -wE"say sprintf '%X', unpack 'U', pack 'U', 0x200000"
200000
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