Rework the arena once again...

example/arena.c

@@ -9,18 +9,14 @@ typedef struct {
 
 int main(void)
 {
-    /* Arena arena = gebs_arena_get(512); */
-    Arena arena = gebs_arena_get(128);
+    Arena arena = gebs_arena_get();
     defer { arena_destroy(&arena); }
 
     Ints ints = {0};
-    for (size_t i = 0; i < 100; i++) {
+    for (size_t i = 0; i < 10000; i++) {
         list_append_alloc(&arena, &ints, i);
-        gebs_arena_reset(&arena);
-    }
-    for (size_t i = 0; i < ints.count; i++) {
-        printf("%zu\n", i);
     }
+    gebs_arena_reset(&arena);
 
     printf("%s\n", fmt("Hello formatting %d", 124));