title: Keychain Item Updates Denied After Update on Lion
body: <p>I have an app that stores data in the keychain which will be periodically updated. Unsurprisingly, whenever I update the application, keychain once again requires the user's permission for that build. However, keychain does not permit modification (either removing items or overwriting the contents). </p>
  
  <p>Obviously this is a big problem for keychain items that need to be periodically updated. </p>
  
  <p>I have absolutely no issue editing/deleting/modifying keychain items with the same build number. </p>
  
  <p>Any ideas?</p>
  
  <hr>
  
  <p>[Edit: Additions removed]</p>
  
  <p>See my own answer below. </p>