bytes - Perl pragma to force byte semantics rather than character semantics
use bytes; no bytes;
WARNING: The implementation of Unicode support in Perl is incomplete. See the perlunicode manpage for the exact details.
Perl normally assumes character semantics in the presence of character data (i.e. data that has come from a source that has been marked as being of a particular character encoding).
To understand the implications and differences between character semantics and byte semantics, see the perlunicode manpage.