Over and over I see people recommending that we use perl -d. However, I find it more convenient to use the #/.... -d syntax. Idiosyncratic? Maybe. But it's a 10 year idiosyncracy. So the question: why is perl -d good/better?
BTW, I found in 5.6... And 5.8... on Solaris that -w and -d do not play nicely. But once I switched to "use warnings" the problems went away.