Fix sign mismatch in `valueToString`
Fix sign mismatch in `valueToString`

`valueToString` takes an argument `unsigned int precision`, but it is used with `%d` rather than `%u` in the `snprintf` format string. Make the format string look for an unsigned value instead.
Streamlet/GoogleHelper,Streamlet/GoogleHelper,Streamlet/GoogleHelper,Streamlet/GoogleHelper,Streamlet/GoogleHelper