Cross-platform threading, smartptrs, etc.

[target.san]

Hi!
I'm now trying to implement tuple and table marshalling for thread messages.
Looked at code, I have a small question: why no existing subj was used, at example Boost, which also has several useful things like smart pointers etc.?
Don't take me wrong, I'm not trying to start additional holywar. I just want to know what was design decision behind this, and whether Love2d implementation is restricted to the current dependency list.
Thanks!