So if it actually matters, you do a better implementation. Or hack the Rails code and share your improvement back to the community. But the fact is, in most ci

So if it actually matters, you do a better implementation. Or hack the Rails code and share your improvement back to the community. But the fact is, in most circumstances, good enough is good enough. And making programmer's lives easier is generally more valuable than corner-case optimization that makes things really hard to implement and understand.