[jQuery] long-term browser support strategy

[jQuery] long-term browser support strategy

What is jQuery's long-term strategy for browser support - cut off
browsers after a certain number of years or when going below a certain
market share?
[I'm asking because of the current trend
among some webdevs and also
library developers
advocating to remove IE6 support and force these
users to upgrade their browser. I work with several clients that do
not want to "lead the way" in this respect, and need to support IE6 as
long as it has a fair usage share, which may be for several more
years.]
Thanks
Mike