|NN const U8 *const start|NN const U8 *const send \
|STRLEN uoffset|STRLEN uoffset0|STRLEN boffset0
s |void |utf8_mg_pos_cache_update|NN SV *sv|NN MAGIC **mgp \
- |STRLEN byte|STRLEN utf8
+ |STRLEN byte|STRLEN utf8|STRLEN blen
s |STRLEN |sv_pos_b2u_forwards|NN const U8 *s|NN const U8 *const target
s |STRLEN |sv_pos_b2u_midway|NN const U8 *s|NN const U8 *const target \
|NN const U8 *end|STRLEN endu