ms precision in fromStringJulianTAI_ISO()

[NiklasPhabian]

in fromStringJulianTAI_ISO(), we hardcode the precision of milliseconds to 3.
Would it be possible to have them be variable length ... anything between the decimal separator . and the forward res (? .
This is really just about style. I just feel bad for quietly truncating.

TemporalIndex::fromStringJulianTAI_ISO(string inputString) {}

...
PARSE_INT(millisecond,3);
...

[michaelleerilee]

We could change the parsing to seek the end of the subsecond digits. And then quietly truncate to the number of digits actually encoded.