Does 4.x + UFS2 exist in any way ?

[Joe Schmoe]

I need to run 4.x (currently 4.10-RELEASE) but I really want to use UFS2 because I also need larger files and filesystems, and I really want to use snapshots.
 
Is UFS2 available on 4.10 ?  If not, how big of a hack would it be to try to use UFS2 with 4.10-RELEASE ?
 
thanks.

		
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