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The weight scanner routine scanner_next() did not properly handle the cases when a contraction produces no weights (is ignorable). Adding a helper routine my_uca_scanner_set_weight() and using it in all cases: - A single ASCII character - A contraction starting with an ASCII character - A multi-byte character - A contraction starting with a multi-byte character Also adding two other helper routines: - my_uca_scanner_next_expansion_weight() - my_uca_scanner_set_weight_outside_maxchar() to avoid using scanner->wbeg directly inside scanner_next(). This reduces the probability of similar future bugs.