# String stuff.
length length ck_lengthconst istu% S?
-substr substr ck_fun st@ S S S?
+substr substr ck_fun st@ S S S? S?
vec vec ck_fun ist@ S S S
index index ck_index ist@ S S S?
# For multi-threading
lock lock ck_rfun s% S
-specific thread-specific ck_null ds0
+threadsv per-thread variable ck_null ds0