Struct core.time.FracSec

This is the portion of the time which is smaller than a second and it cannot hold values which would be greater than or equal to a second (or less than or equal to a negative second).

It holds hnsecs internally, but you can create it using either milliseconds, microseconds, or hnsecs. What it does is allow for a simple way to set or adjust the fractional seconds portion of a Duration or a std.datetime.SysTime without having to worry about whether you're dealing with milliseconds, microseconds, or hnsecs.

FracSec's functions which take time unit strings do accept "nsecs", but because the resolution of Duration and std.datetime.SysTime is hnsecs, you don't actually get precision higher than hnsecs. "nsecs" is accepted merely for convenience. Any values given as nsecs will be converted to hnsecs using convert (which uses truncating division when converting to smaller units).

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