To ensure thread safety change usages of stringbuilder to string. #6
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string is potentially being updated in 2 threads, both driven by Observable.interval.
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string is potentially being updated in 2 threads, both driven by Observable.interval. I could be wrong, I am new to reactive. But I think 2 Observable.Intervals() mean we have 2 different threads updating the stringbuilder which means we should use string.
I think just changing to string is enough as the only operation in the second thread is the clear, so higher level synchronization is not needed.