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If LIMIT is omitted (or, equivalently, zero), then it is usually treat
+ed as if it were instead negative but with the exception that trailin
+g empty fields are stripped (empty leading fields are always preserve
+d);

perl -MData::Dumper -e "$str='foo:bar:'; ($x,@opt)=split /:/,$str,-1;p
+rint Dumper ($x,\@opt)"
$VAR1 = 'foo';
...
          ''
        ];