In my opinion, this may lead to some inconsistencies.
Here's a relatively recent discussion about it on p5p mailing list: http://www.nntp.perl.org/group/perl.perl5.porters/2015/01/msg224867.html

In reply to Re^3: UTF-8 strings and the bytes pragma by Anonymous Monk
in thread UTF-8 strings and the bytes pragma by trizen

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