adriancole commented on issue #2587: Reduces array copying when converting uint64 to hex strings URL: https://github.com/apache/incubator-zipkin/pull/2587#issuecomment-491509150 before ``` SpanBenchmarks.buildClientSpan:buildClientSpan·p0.99 sample 0.619 us/op SpanBenchmarks.buildClientSpan:·gc.alloc.rate.norm sample 15 624.051 ± 0.003 B/op SpanBenchmarks.buildClientSpan_longs:buildClientSpan_longs·p0.99 sample 0.763 us/op SpanBenchmarks.buildClientSpan_longs:·gc.alloc.rate.norm sample 15 984.050 ± 0.003 B/op ``` after ``` SpanBenchmarks.buildClientSpan:buildClientSpan·p0.99 sample 0.654 us/op SpanBenchmarks.buildClientSpan:·gc.alloc.rate.norm sample 15 624.048 ± 0.004 B/op SpanBenchmarks.buildClientSpan_longs:buildClientSpan_longs·p0.99 sample 0.752 us/op SpanBenchmarks.buildClientSpan_longs:·gc.alloc.rate.norm sample 15 840.052 ± 0.007 B/op ```
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