deprecation prior to stable alternative?

From: Date: Fri, 07 Nov 2008 17:15:33 +0000
Subject: deprecation prior to stable alternative?
Groups: php.pear.general 
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While installing HTML_QuickForm, the process told me it was deprecated in favor of HTML_QuickForm2. So I tried to install that, and found that the latest version, 0.2.0, is "stability alpha". Probably a dumb question, but why is an old version "deprecated" before there is a stable alternative?

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