Make improvements

- Emulator can now test the αcτµαlly pδrταblε εxεcµταblε bootloader

- Whipped up a webserver named redbean. It services 150k requests per
  second on a single core. Bundling assets inside zip enables extremely
  fast serving for two reasons. The first is that zip central directory
  lookups go faster than stat() system calls. The second is that both
  zip and gzip content-encoding use DEFLATE, therefore, compressed
  responses can be served via the sendfile() system call which does an
  in-kernel copy directly from the zip executable structure. Also note
  that red bean zip executables can be deployed easily to all platforms,
  since these native executables work on Linux, Mac, BSD, and Windows.

- Address sanitizer now works very well

libc/fmt/palandftoa.c

@@ -34,16 +34,13 @@
 #include "libc/fmt/palandprintf.h"
 #include "libc/math.h"
 
-static const int kPow10[] = {1,      10,      100,      1000,      10000,
-                             100000, 1000000, 10000000, 100000000, 1000000000};
-
 /**
  * Formats floating point number.
  *
  * @see xdtoa() for higher precision at the cost of bloat
  * @see palandprintf() which is intended caller
  */
-int ftoa(int out(int, void *), void *arg, long double value, unsigned long prec,
+int ftoa(int out(int, void *), void *arg, long double value, int prec,
          unsigned long width, unsigned long flags) {
   long whole, frac;
   long double tmp, diff;
@@ -72,32 +69,31 @@ int ftoa(int out(int, void *), void *arg, long double value, unsigned long prec,
       prec = 6;
     }
 
-    /* limit precision to 9, cause a prec >= 10 can lead to overflow errors */
-    while (len < PRINTF_FTOA_BUFFER_SIZE && prec > 9) {
+    while (len < PRINTF_FTOA_BUFFER_SIZE && prec > 14) {
       buf[len++] = '0';
       prec--;
     }
 
     whole = truncl(fabsl(value));
-    tmp = (fabsl(value) - whole) * kPow10[prec];
+    tmp = (fabsl(value) - whole) * exp10l(prec);
     frac = tmp;
     diff = tmp - frac;
 
-    if (diff > 0.5) {
+    if (diff > .5) {
       ++frac; /* handle rollover, e.g. case 0.99 with prec 1 is 1.0 */
-      if (frac >= kPow10[prec]) {
+      if (frac >= exp10l(prec)) {
         frac = 0;
         ++whole;
       }
-    } else if (diff < 0.5) {
+    } else if (diff < .5) {
     } else if (!frac || (frac & 1)) {
       ++frac; /* if halfway, round up if odd OR if last digit is 0 */
     }
 
     if (!prec) {
       diff = fabsl(value) - whole;
-      if ((!(diff < 0.5) || (diff > 0.5)) && (whole & 1)) {
-        /* exactly 0.5 and ODD, then round up */
+      if ((!(diff < .5) || (diff > .5)) && (whole & 1)) {
+        /* exactly .5 and ODD, then round up */
         /* 1.5 -> 2, but 2.5 -> 2 */
         ++whole;
       }