Changed the opcode of _pickle module to look for 00 and 01 specifically

The python pickle module looks for "00" and "01" but _pickle only looked for 2 characters that parsed to 0 or 1, meaning some payloads like "+0" or " 0" would lead to different results in different implementations

Author: Legoclones

Modules/_pickle.c

@@ -5255,7 +5255,7 @@ load_int(PickleState *state, UnpicklerObject *self)
         }
     }
     else {
-        if (len == 3 && (x == 0 || x == 1)) {
+        if (len == 3 && s[0] == '0' && (s[1] == '0' || s[1] == '1')) {
             if ((value = PyBool_FromLong(x)) == NULL)
                 return -1;
         }