Any reason for differentiating the type of Result.Latencies and Result.Requests ?

[baiwfg2]

I did a careful comparison for ReadonlyUint64Histogram and ReadonlyFloat64Histogram , and found no significant difference between them. See the following compare result:

Just change between float64 and uint64, so leading to some kind of impression that redundant codes exist.

Is there any special reason to give latency uint64 type and give request float64 type ?