Revert changes to DIGIT size, have to change RBIGNUM_LEN

vm/capi/19/include/ruby/ruby.h

@@ -950,12 +950,27 @@ VALUE rb_uint2big(unsigned long number);
 #define RBIGNUM_POSITIVE_P(b) RBIGNUM_SIGN(b)
 #define RBIGNUM_NEGATIVE_P(b) (!RBIGNUM_SIGN(b))
 
-  // fake out, used with RBIGNUM_LEN anyway, which provides
-  // the full answer
-#define SIZEOF_BDIGITS 1
-#define BDIGIT_DBL unsigned short
-#define BDIGIT_DBL_SIGNED short
-#define BDIGIT unsigned char
+#if SIZEOF_INT*2 <= SIZEOF_LONG_LONG
+# define BDIGIT unsigned int
+# define SIZEOF_BDIGITS SIZEOF_INT
+# define BDIGIT_DBL unsigned LONG_LONG
+# define BDIGIT_DBL_SIGNED LONG_LONG
+#elif SIZEOF_INT*2 <= SIZEOF_LONG
+# define BDIGIT unsigned int
+# define SIZEOF_BDIGITS SIZEOF_INT
+# define BDIGIT_DBL unsigned long
+# define BDIGIT_DBL_SIGNED long
+#elif SIZEOF_SHORT*2 <= SIZEOF_LONG
+# define BDIGIT unsigned short
+# define SIZEOF_BDIGITS SIZEOF_SHORT
+# define BDIGIT_DBL unsigned long
+# define BDIGIT_DBL_SIGNED long
+#else
+# define BDIGIT unsigned short
+# define SIZEOF_BDIGITS (SIZEOF_LONG/2)
+# define BDIGIT_DBL unsigned long
+# define BDIGIT_DBL_SIGNED long
+#endif
 
   /** Calls this method in a superclass. */
   VALUE rb_call_super(int argc, const VALUE *argv);