$Data::Dumper::Deparse or $OBJ->Deparse([NEWVAL])
Can be set to a boolean value to control whether code references are turned into perl source code. If set to a true value, B::Deparse will be used to get the source of the code reference. Using this option will force using the Perl implementation of the dumper, since the fast XSUB implementation doesn't support it.
The implication is clearly that by default it doesn't output source code. This is because you can't normally examine coderefs as source. It requires magic, unlike the other data types that Data::Dumper dumps.
Caution: Contents may have been coded under pressure.