Use tb.Cleanup to simplify both the API and the implementation.
One behavior change: When the number of goroutines shrinks, don't log.
I've never found these logs to be useful, and they frequently add noise.
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
Inclusion of the word "assert" made it seem like a failure, even though
it was supposed to be identifying the name of the function (Assert()).
Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
Josh Bleecher Snyder
David Crawshaw
Avery Pennarun
David Anderson
Earl Lee