http://www.perlmonks.org?node_id=1106256


in reply to Re^2: syntax of Data::Dump
in thread syntax of Data::Dump

Well footnote 7 does say:

Some contexts allow 2 or even 1 digit, but any usage without exactly three digits, the first being a zero, may give unintended results. (For example, in a regular expression it may be confused with a backreference; see "Octal escapes" in perlrebackslash.)

So it would be much more clear with the 3 digit representation. But in this particular context, it works out:

use feature 'say'; use Data::Dump qw(dump); say dump( pack("c*", 10, 3, 30, 21 ) ); # outputs "\n\3\36\25" say dump( unpack("c*", "\n\3\36\25") ); # outputs (10, 3, 30, 21) say dump( unpack("c*", "\n\003\036\025") ); # outputs (10, 3, 30, 21)