improve getHashCode by removing fmt.Sprintf #111
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I'm using this library to perform quite a bit of ancestor query but is hitting high cpu usage.
did profiling and found out that getHashCode is rather expensive.
did some further research and found out that sprintf can be expensive as shown in the profiling results
https://medium.com/swlh/bad-go-frivolous-sprintf-2ad28fedf1a0
https://hackernoon.com/fmtsprintf-looks-simple-but-will-burn-a-hole-in-your-pocket
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