some progress, but mainly convert the TODO's into static_assert(0, ...)

cig.h

@@ -15,10 +15,6 @@ typedef union any_align { char c; int i; long l; long long ll; float f; double d
 #define MB (KB * KB)
 #define GB (KB * KB * KB)
 #define PTR_FROM_FIELD_PTR(STRUCT, FIELD, PTR) ((STRUCT *) (((char *) PTR) - offsetof(STRUCT, FIELD)))
-#define TODO(...) do { \
-	fprintf(stderr, "%s:%d: TODO: %s", __FILE__, (int)__LINE__, #__VA_ARGS__);\
-	exit(1); \
-} while (0)
 
 // Contains all operations an allocator can do. Similar interface to sdtlibs
 // malloc, realloc and free.
@@ -239,11 +235,15 @@ void arr_qsort(void *this, dyn_array_cmp_fn cmp_fn);
 
 // maps ////////////////////////////////////////////////////////////////////
 
-typedef int (*hash_func_t)(void *key);
-typedef int (*equals_func_t)(void *key1, void *key2);
+typedef unsigned int (*hash_func_t)(void *key);
+typedef bool (*equals_func_t)(void *key1, void *key2);
 
 typedef struct map_header {
-	int n_items, capacity, itemsize, keysize, mapping_capacity;
+	int capacity;
+	int itemsize;
+	int keysize;
+	int mapping_capacity;
+	int n_items;
 	allocator_t allocator;
 	hash_func_t hash;
 	equals_func_t equals;