Update vtype comparison

src/__internal/include.h

@@ -1,6 +1,8 @@
 /* This software is licensed by the MIT License, see LICENSE file */
 /*                                Copyright © 2022 Gregory Lirent */
 
+#include <float.h>
+#include <math.h>
 #include <stddef.h>
 #include <stdlib.h>
 
@@ -32,6 +34,8 @@
 #define true  ((_Bool)1)
 #define false ((_Bool)0)
 
+#define abs(v) _Generic((v), ldbl_t: fabsl, dbl_t: fabs, fl_t: fabsf)(v)
+
 #include "__attributes.h"
 
 typedef vtype_uint8      u8_t;