Rails - May 2006 - params isn''t cleared between requests?

Hi,

I just noticed that the params hash isn''t being cleared between 
invocations, at least in an Ajax scenario I got into, or at least 
behaved very strange.

I have an observer on a checkbox which sends its value as it is changed.

First click sent value=1 and arrived into params with value=1
Second click sent value=undefined and arrived into params with value=1 
(instead of undefined which was in the POST data).

If in the controller after using the params[:value] I deleted the :value 
param then the POST data would arrive just fine.

Any explanation how can this be?

Thanks



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