fromSeconds() when using "uneven frame rates"?

[seabasss]

Should I round up my frame rates when I use the fromSeconds() function?

SMPTE.fromSeconds(3600, 24, false) gives me the expected 01:00:00:00. However
SMPTE.fromSeconds(3600, 23.976, false) gives me 00:59:56:09.

I kinda understand why, but 3600 seconds, shouldn't that be 01:00:00:00 in any frame rate?