Make improvements

- Add hierarchical auto-completion to redbean's repl
- Fetch latest localtime() and strftime() from Eggert
- Shave a few milliseconds off redbean start latency
- Fix redbean repl with multi-line statements
- Make the Lua unix module code more elegant
- Harden Lua data structure serialization

libc/str/strchrnul.c

@@ -53,6 +53,8 @@ noasan static inline const char *strchrnul_sse(const char *s, unsigned char c) {
 /**
  * Returns pointer to first instance of character.
  *
+ * If c is not found then a pointer to the nul byte is returned.
+ *
  * @param s is a NUL-terminated string
  * @param c is masked with 255 as byte to search for
  * @return pointer to first instance of c, or pointer to