Add missing type annotations on new purge_contexts method (oops!)

sdeibel · sdeibel · commit d71ee202f505 · 2023-03-01T15:37:22.000-05:00
diff --git a/coverage/sqldata.py b/coverage/sqldata.py
@@ -641,7 +641,7 @@ def purge_files(self, filenames: Collection[str]) -> None:
                     continue
                 con.execute_void(sql, (file_id,))
 
-    def purge_contexts(self, contexts):
+    def purge_contexts(self, contexts: Collection[str]) -> None:
         """Purge any existing coverage data for the given `contexts`.
 
         This removes all coverage data for the contexts, but does not remove
