py/objint: Make byteorder argument optional in int.from_bytes() method.

This was made optional in CPython 3.11.
Signed-off-by: Amirreza Hamzavi <amirrezahamzavi2000@gmail.com>

py/objint.c

@@ -390,7 +390,6 @@ mp_obj_t mp_obj_int_binary_op_extra_cases(mp_binary_op_t op, mp_obj_t lhs_in, mp
 // this is a classmethod
 static mp_obj_t int_from_bytes(size_t n_args, const mp_obj_t *args) {
     // TODO: Support signed param (assumes signed=False at the moment)
-    (void)n_args;
 
     // get the buffer info
     mp_buffer_info_t bufinfo;
@@ -398,7 +397,8 @@ static mp_obj_t int_from_bytes(size_t n_args, const mp_obj_t *args) {
 
     const byte *buf = (const byte *)bufinfo.buf;
     int delta = 1;
-    if (args[2] == MP_OBJ_NEW_QSTR(MP_QSTR_little)) {
+    bool big_endian = n_args < 3 || args[2] != MP_OBJ_NEW_QSTR(MP_QSTR_little);
+    if (!big_endian) {
         buf += bufinfo.len - 1;
         delta = -1;
     }
@@ -409,7 +409,7 @@ static mp_obj_t int_from_bytes(size_t n_args, const mp_obj_t *args) {
         #if MICROPY_LONGINT_IMPL != MICROPY_LONGINT_IMPL_NONE
         if (value > (MP_SMALL_INT_MAX >> 8)) {
             // Result will overflow a small-int so construct a big-int
-            return mp_obj_int_from_bytes_impl(args[2] != MP_OBJ_NEW_QSTR(MP_QSTR_little), bufinfo.len, bufinfo.buf);
+            return mp_obj_int_from_bytes_impl(big_endian, bufinfo.len, bufinfo.buf);
         }
         #endif
         value = (value << 8) | *buf;
@@ -417,7 +417,7 @@ static mp_obj_t int_from_bytes(size_t n_args, const mp_obj_t *args) {
     return mp_obj_new_int_from_uint(value);
 }
 
-static MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(int_from_bytes_fun_obj, 3, 4, int_from_bytes);
+static MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(int_from_bytes_fun_obj, 2, 4, int_from_bytes);
 static MP_DEFINE_CONST_CLASSMETHOD_OBJ(int_from_bytes_obj, MP_ROM_PTR(&int_from_bytes_fun_obj));
 
 static mp_obj_t int_to_bytes(size_t n_args, const mp_obj_t *args) {