Rails - Feb 2006 - Preserving seconds fraction in PG timestamps when updating?

I have this code:

Link.find(params[:id]).toggle!(''active'')

Before it, its timestamp is:

2005-11-20 20:45:48.741973-07

After:

2005-11-20 20:45:48-07

Why does Rails take it upon itself to truncate the
seconds fraction? How can I get Rails to not change 
it?

Thanks,
csn

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