address review: some comments

Author: skirpichev

Include/internal/pycore_long.h

@@ -231,6 +231,7 @@ _PyLong_IsPositive(const PyLongObject *op)
     return (op->long_value.lv_tag & SIGN_MASK) == 0;
 }
 
+/* Return true if the argument is a small int */
 static inline bool
 _PyLong_HasImmortalTag(const PyLongObject *op)
 {

Lib/test/test_capi/test_long.py

@@ -805,8 +805,11 @@ def to_digits(num):
 
     def test_bug_143050(self):
         with support.adjust_int_max_str_digits(0):
+            # Bug coming from using _pylong.int_from_string(), that
+            # currently requires > 6000 decimal digits.
             int('-' + '0' * 7000, 10)
             _testcapi.test_immortal_small_ints()
+            # Test also nonzero small int
             int('-' + '0' * 7000 + '123', 10)
             _testcapi.test_immortal_small_ints()