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Removed duplicate call site chain search #483
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Minor PERF update: Since the call site chain is an
ISet, theAddmethod return value makes the call to theContainsmethod redundant.Effectively this means, that the call site chain is only searched once, instead of twice.
The performance benefit from this is probably very small. I stumbled over it accidentally while debugging the default
ServiceProvider. But it can't hurt to try to optimize things.