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mbstring has a great deal of dead code. Some common types are: - Default switch clauses which will never be taken - If clauses intended to convert codepoints which were not present in a conversion table... but the codepoint in question *is* in the table, so the if clause is not needed. - Bounds checks in places where it is not possible for a value to ever be out of bounds. - Checks to see if an unmatched Unicode codepoint is in CP932 extension range 3... but every codepoint in range 3 is also in range 2, so no codepoint will ever be matched and converted by that code.