Gmail bug :D

This is a small bug in Gmail. I don’t know if it’s included in the documentation. I like the way search in Google works. It’s far better than yahoo. I like Gmail’s label too. I wanted to create a label by the name “important”. Shocking! I wasn’t able to create!!! I clicked a mail and then said add new label. I entered important and the label disappeared. I tried this many times, and by mistake I typed importanta. This time the label appeared. I was wondering what was wrong. Then I moved to “edit labels” and added a label. When I gave the name as important it displayed “not valid”.. Funny thing: ) )