update example to handle race condition#445
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The example code does not include a check to see if another goroutine created the client between the b.lock.RUnlock() and b.lock.Lock() calls. As this is required for all clients to properly handle this race condition, it should be included in the example code.
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The example code does not include a check to see if another goroutine created the client between the b.lock.RUnlock() and b.lock.Lock() calls. As this is required for all clients to properly handle this race condition, it should be included in the example code.