# endif
sR |I32 |expect_number |NN char** pattern
#
-s |STRLEN |sv_pos_u2b_forwards|NN const U8 *const start \
+sn |STRLEN |sv_pos_u2b_forwards|NN const U8 *const start \
|NN const U8 *const send|STRLEN uoffset
-s |STRLEN |sv_pos_u2b_midway|NN const U8 *const start \
+sn |STRLEN |sv_pos_u2b_midway|NN const U8 *const start \
|NN const U8 *send|STRLEN uoffset|STRLEN uend
s |STRLEN |sv_pos_u2b_cached|NN SV *sv|NN MAGIC **mgp \
|NN const U8 *const start|NN const U8 *const send \