DProf seems to be lying.
If in U.pm you replace:
use T;
with:
BEGIN { require T; warn "executing BEGIN\n"; }
you will only see the warning once, and dprofpp will still show 10002 calls to U::BEGIN.
from perldoc perlmod:
use Module ();
is exactly equivalent to
BEGIN { require Module; }
Now, that said, I can't tell you why it's lying :)
dug
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