@@ -77,7 +77,7 @@ def async_add_records(self, entries: Iterable[DNSRecord]) -> bool:
         return new
 
     def async_all_by_details(self, name: _str, type_: _int, class_: _int) -> list[DNSRecord]:
-        """Gets all matching entries by details.
+        """Return every cached record carrying this name, type and class.
 
         This function is not thread-safe and must be called from
         the event loop.
 
@@ -247,8 +247,9 @@ def async_response(  # pylint: disable=unused-argument
                 continue
             if ucast_source:
                 query_res.add_ucast_question_response(answer_set)
-            # We always multicast as well even if its a unicast
-            # source as long as we haven't done it recently (75% of ttl)
+            # The answer also goes out by multicast even for a unicast
+            # source; a copy multicast within the last second is folded
+            # into the aggregated response instead (RFC 6762 section 14)
             query_res.add_mcast_question_response(answer_set)
 
         return query_res.answers()
 
@@ -90,7 +90,9 @@ cdef class ServiceInfo(RecordUpdateListener):
 
     @cython.locals(
         length="unsigned char",
-        index="unsigned int",
+        pos="unsigned int",
+        start="unsigned int",
+        total="unsigned int",
         key_value=bytes,
         key=bytes,
         sep=bytes,
 
@@ -1044,26 +1044,26 @@ def _set_text(self, text: bytes) -> None:
     def _unpack_text_into_properties(self) -> None:
         """Unpacks the text field into properties"""
         text = self.text
-        end = len(text)
-        if end == 0:
+        total = len(text)
+        if total == 0:
             # Properties should be set atomically
             # in case another thread is reading them
             self._properties = {}
             return
 
-        index = 0
         properties: dict[bytes, bytes | None] = {}
-        while index < end:
-            length = text[index]
-            index += 1
-            key_value = text[index : index + length]
+        pos = 0
+        while pos < total:
+            length = text[pos]
+            start = pos + 1
+            key_value = text[start : start + length]
+            pos = start + length
             key, sep, value = key_value.partition(b"=")
             if key not in properties:
                 # RFC 6763 section 6.4 distinguishes a key with no '=' (a
                 # boolean attribute: present, no value) from `key=` (present
                 # with an empty value), so test the separator, not the value.
                 properties[key] = value if sep else None
-            index += length
 
         self._properties = properties