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echo Range iterator outside integer range|splain
Range iterator outside integer range (#1)
    (F) One (or both) of the numeric arguments to the range operator "
+.."
...
    One possible workaround is to force Perl to use magical string inc
+rement
    by prepending "0" to your numbers.

sub range {
  my( $start, $end ) = @_;
...
for(range( $x , $x+2 )) {
  say
}