 assuming the speaker does mean the negation of what is literally said. However, although in a sense the act is indirect, since the speaker asserts something different from what she would do on a normal, direct use of the sentence, and relies on the hearer to realize this, it is not an indirect assertion by either definition. It isn’t on the first, since the primary act (the literal assertion) isn’t even made, and it isn’t on the second, since there is no discrepancy between force and sentence  type.[8]