NSFileWrapper Modification Date Bug

Overview

This repository demonstrates a bug in NSFileWrapper where overwriting a file with the same content using -[NSFileWrapper writeToURL:options:originalContentsURL:error:] sometimes causes the file's modification date to be set in the past instead of updating to the current time.

Reproduction Steps

1. Clone this repository
2. Open the Xcode project and run the testWriteFile test.
3. The test should fail ~50% of the times (the test runs 10 times)

Expected Behavior

When a file is overwritten, its modification date should either update to the current time or remain unchanged.

Actual Behavior

In some cases, the modification date is unexpectedly set to an earlier timestamp rather than reflecting the actual write time.

System Information

This issue has been observed on:

• macOS version: 15.4 Beta (24E5206s)
• Xcode version: Version 16.2 (16C5032a)