Code/UI variables collision

If you have an action with an OPTIONAL parameter and there was previously defined a user rules variable with the same name as the optional parameter, AND that parameter has no value, then it occasionally gets the value from the variable.

I tried to make a simple demonstration, so you can easily try it in seconds: https://github.com/OnkelTem/drupal_vartest
Extract it where you have your modules, and then enable "Vartest_feature".
Prereqs: Features, Rules.