Simple Question regarding Hot Keys for Trimming Comps

Hi Adobe Family,

I've been curious for a while about this feature. Anyone who uses AE on a regular basic is quite familiar with the composition trimming hot keys using   alt + [  and  alt + ].   When trimming the front-end of a comp using the hot key, the program will trim the comp to the exact location of the time indicator. However, when you trim the back-end of the comp, the trimming will actually take place one frame later than the location of the time indicator.

Ex. If I set my time indicator to the 10th frame in my comp, then trim the back-end using alt + ], the comp will be timmed at the 11th frame instead of the 10th.

This is not necessarily an issue I'm dealing with, it's more of a general curiousity of why that is the default setting - and if there's sound logic to it that will improve my AE workflow overall.

Let me know what you all know!

-Chris