You can stuff a turkey half full of stuffing, but I don't think you can fill a pie half full of filling. It's a question of how the terms are commonly used. We can say the glass is half full/empty , but the result of filling/emptying the glass is (should be) complete.
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griddlerI don't know how I managed to have white behind half the text, there is no great meaning behind it!Been there; done that.