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class Float
  alias :old_divide :/ 
...
    other == 0 ? nil : old_divide(other)
  end
end

class MyFloat < Float
  def MyFloat.new(from)
...
  end
end
MyFloat.new(4) / 0 # nil

use warnings;

...
    no warnings qw/uninitialized/;
    $foo = 5 - $qux;
}