fix bugprone-*

* bugprone-throw-keyword-missing
* bugprone-unhandled-self-assignment
* bugprone-suspicious-string-compare
* bugprone-reserved-identifier
* bugprone-narrowing-conversions
* bugprone-macro-parentheses
* bugprone-implicit-widening-of-multiplication-result
* bugprone-exception-escape
* bugprone-copy-constructor-init

src/Base/Stream.cpp

@@ -602,6 +602,7 @@ PyStreambuf::int_type PyStreambuf::underflow()
             return traits_type::eof();
         }
 
+        // Check: bugprone-not-null-terminated-result
         std::memcpy(start, c.data(), c.size());
     }
     catch (Py::Exception& e) {