In this case it will. Or if you set all warnings to be fatal then you're extra "safe". Depending on how you use the value though, you may or may not get a warning. If you just use it as a boolean you do not get a warning:
if ($hash{pensionbalance}) {
  print "Got a pension balance!\n";
}

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In reply to Re^6: RFC: Tutorial: use strict; now what!? by runrig
in thread RFC: Tutorial: use strict; now what!? by Xiong

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