This Boolean Never Turns True

So I'm playing around with keyboard event handlers in JavaScript, and I notice that Mozilla has a field called isChar documented. isChar becomes is true when the key is a character.

Simple enough, right?

Well... no. From the linked documentation:

There is currently a known bug affecting the return result, which is always false and never true. Please see the discussion link in the sidebar for more details.

Fortunately it's a known bug. Well, sort of. It's actually still marked "NEW" meaning no one at Mozilla has verified it exists. Or even looked at it.

Since October 2005. Two years ago.