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