in reply to What is %_
Scanning through the perl 5.6 source-code I found some interesting hints, but no direct evidence as to %_ real purpose.
from /ext/Opcode/Safe.pm
By default, the only variables shared with compartments are the "underscore" variables $_ and @_ (and, technically, the less frequently used %_, the _ filehandle and so on).perlguts has the following mention
L (none) Debugger %_<filename l vtbl_dbline Debugger %_<filename element
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