As suggested by Russ Cox, making sure we see all byte values doesn't
take long and is a superset of the existing test.
Change-Id: Ifc7f18ca4189c89a3d06d0408150a2464ce5e590
Reviewed-on: https://go-review.googlesource.com/c/go/+/608397
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Roland Shoemaker <roland@golang.org> Reviewed-by: Daniel McCarney <daniel@binaryparadox.net> Reviewed-by: Michael Knyszek <mknyszek@google.com>