-/* Dont remember what this was used for :-) */
-unsigned char getPreviousLevel(unsigned char* level, int from)
+/*
+ * Find the most recent run of the same value in `level', and
+ * return the value _before_ it. Used to process U+202C POP
+ * DIRECTIONAL FORMATTING.
+ */
+int getPreviousLevel(unsigned char* level, int from)