So far we had the rule that '' == '', '0_' == '0', but '_' > ''. This means that the general rule that strings are compared iteratively, and each segment that compares equal can be dropped and the comparison resumes at the following characters wasn't true in such cases. Similarly, '0~' < '0', but after dropping the common segment, '~' > ''. The special handling of empty strings is dropped, and '_' == '' and '~' < ''.
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