Request for review of activesupport patches

I've got a test suite trifecta going here; all three need review, comments
and (hopefully) approval:

http://dev.rubyonrails.org/ticket/9019
"Fix time_with_datetime_fallback on really old dates"
This is a bug in time_with_datetime_fallback. The test suite currently
fails for me without this patch.

http://dev.rubyonrails.org/ticket/9020
"Fix activesupport time tests"
This is a simple "we want an explicit timezone" patch.

http://dev.rubyonrails.org/ticket/9021
"Fix atomic_file write test"
This failure may not occur for some people whose /tmp is on the same
partition as their code tree.

Comments (especially ones including the magic string '+1' <grin>) gratefully
appreciated.

- Matt