i used this script, a little clunky but it got the job done
```bash
for file in `find . -type f -print | grep '\.go'`; do
sed '1,/^\/\/ limitations under the License.$/d' $file > $file.tmp;
result=`cat $file.tmp`
if [[ result != "" ]]; then
gofmt $file.tmp &> /dev/null;
if [[ $? == 0 ]]; then
mv $file.tmp $file && gofmt -w $file;
else
rm $file.tmp;
fi
else
rm $file.tmp;
fi
done
```
The random-value tests can be pathological, and in particular, the
test of arbitrarily-spaced values is in effect O(N^2), and with race
testing on, that test *alone* can take ten minutes to run, but
it's not really all that exciting. We just reduce a bunch of values
and/or test fewer things for these, which doesn't significantly alter
coverage, but reduces test runtime on my laptop with `-race` from
21 minutes to a bit under 5.
