note dragonchild Hrmm ... 5.8.4/Solaris doesn't seem to do the right thing. <code> BEGIN { &Internals::SvREADONLY(\undef, 0); undef = 42; &Internals::SvREADONLY(\undef, 1); } my $x = undef; print( ((undef) ? 'True' : 'False'), $/); print( ((defined undef) ? 'True' : 'False'), $/); print( (($x) ? 'True' : 'False'), $/); print( ((defined $x) ? 'True' : 'False'), $/); -------------- True True False False </code> Maybe the code isn't actually affecting SV_UNDEF as you think ... <!-- Node text goes above. Div tags should contain sig only --> <div class="pmsig"><div class="pmsig-85580"> <p align="center"><i><font size="-2">Being right, does not endow the right to be rude; politeness costs nothing.<br>Being unknowing, is not the same as being stupid.<br>Expressing a contrary opinion, whether to the individual or the group, is more often a sign of deeper thought than of cantankerous belligerence.<br>Do not mistake your goals as the only goals; your opinion as the only opinion; your confidence as correctness. Saying you know better is not the same as explaining you know better.</font></i></p> </div></div> 410871 410969