fixup! PI: Don't load entire file into memory when passed file name

Author: mjsir911

pypdf/_reader.py

@@ -314,6 +314,7 @@ def __init__(
 
         if isinstance(stream, (str, Path)):
             stream = open(stream, "rb")  #  noqa: SIM115
+            # Wish I could just close stream in __del__ but that fails a test very strangely
             weakref.finalize(self, stream.close)
 
         self.read(stream)

tests/test_writer.py

@@ -1234,6 +1234,7 @@ def test_set_page_label(pdf_file_path):
     writer.set_page_label(0, 1, "/A")
     writer.write(pdf_file_path)
     assert PdfReader(pdf_file_path).page_labels[: len(expected)] == expected
+    del writer
 
     pdf_file_path.unlink()
 
@@ -1477,6 +1478,7 @@ def test_update_form_fields(tmp_path):
     )
 
     writer.write(write_data_here)
+    del writer
     reader = PdfReader(write_data_here)
     flds = reader.get_fields()
     assert flds["CheckBox1"]["/V"] == "/Yes"