This other answer, by wrvhage, has the great property of working correctly for values like 3.005 rounded to two places (where sprintf is not). However, it needs a couple of tweaks to work for negative numbers.
sub stround
{
my( $n, $places ) = @_;
my $sign = ($n < 0) ? '-' : '';
my $abs = abs $n;
$sign . substr( $abs + ( '0.' . '0' x $places . '5' ), 0, $places
++ length(int($abs)) + 1 );
}
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