Add matching comments to tie up a slightly abstraction-breaking bit of code in...

Add matching comments to tie up a slightly abstraction-breaking bit of code in diffoscope.comparators.mising_file and the .dsc/.buildinfo file handling.

diffoscope/comparators/debian.py

@@ -114,6 +114,8 @@ class DebControlFile(File):
 
     @property
     def deb822(self):
+        # Be nicer to .changes and .dsc comparisons; see
+        # diffoscope.comparators.missing_file.MissingFile.deb822
         return self._deb822
 
     def compare_details(self, other, source=None):

diffoscope/comparators/missing_file.py

@@ -104,7 +104,8 @@ class MissingFile(File):
     def magic_file_type(self):
         return self._other_file.magic_file_type
 
-    # Be nice to .changes and .dsc comparisons
+    # Be nice to .changes and .dsc comparisons; see
+    # diffoscope.comparators.debian.DebControlFile.deb822
     @property
     def deb822(self):
         class DummyChanges(dict):