gh-52876: Implement missing parameter in codecs.StreamReaderWriter functions (GH-136498)

Closes GH-52876
(cherry picked from commit 35e2c35)

Co-authored-by: Stan Ulbrych <[email protected]>

Author: StanFromIreland

Lib/codecs.py

@@ -618,7 +618,7 @@ def readlines(self, sizehint=None, keepends=True):
             method and are included in the list entries.
 
             sizehint, if given, is ignored since there is no efficient
-            way to finding the true end-of-line.
+            way of finding the true end-of-line.
 
         """
         data = self.read()
@@ -709,13 +709,13 @@ def read(self, size=-1):
 
         return self.reader.read(size)
 
-    def readline(self, size=None):
+    def readline(self, size=None, keepends=True):
 
-        return self.reader.readline(size)
+        return self.reader.readline(size, keepends)
 
-    def readlines(self, sizehint=None):
+    def readlines(self, sizehint=None, keepends=True):
 
-        return self.reader.readlines(sizehint)
+        return self.reader.readlines(sizehint, keepends)
 
     def __next__(self):
 

Misc/NEWS.d/next/Library/2025-07-10-10-18-19.gh-issue-52876.9Vjrd8.rst

@@ -0,0 +1,3 @@
+Add missing ``keepends`` (default ``True``) parameter to
+:meth:`!codecs.StreamReaderWriter.readline` and
+:meth:`!codecs.StreamReaderWriter.readlines`.