How about $_[0] = eval "*".caller."::G".(0+\$_[0]) unless ref $_[0] eq "GLOB" or ref \$_[0]  eq "GLOB"; before the call to $open? This prevents the call to the standard open to autovivify a GLOB when none is available.

In reply to Re^3: Track open file handles by Eily
in thread Track open file handles by shmem

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