I'm looking at a setup/install script which extends from Mage_Eav_Model_Entity_Setup and noticed that some of the attributes in the return array of the getDefaultEntities method have a 'visible' key (e.g. 'visible' => true) while others have an 'is_visible' key.
Is there a difference between the two? Is one just an unsupported typo that didn't get noticed and got copied and pasted too much?
None of the other Setup.php files in app/code/community or app/code/local use 'is_visible'.
I'm loath to change anything, but I'd like to understand what the differences might be.