prefer os.path.samefile() for checkpoint test

Author: rolandwalker

changelog.md

@@ -35,6 +35,7 @@ Internal
 * Improve test coverage for DSN variable expansion.
 * Test on all platforms in the Publish GitHub Action.
 * Remove unused support for writing `.mylogin.cnf` files.
+* Prefer `os.path.samefile()` for checkpoint distinctness test.
 
 
 1.76.0 (2026/06/20)

mycli/main.py

@@ -329,7 +329,7 @@ def preprocess_cli_args(
         and cli_args.batch != '-'
         and os.path.exists(cli_args.batch)
     ):
-        if os.stat(cli_args.batch) == os.stat(cli_args.checkpoint):
+        if os.path.samefile(cli_args.batch, cli_args.checkpoint):
             click.secho('Error: --batch and --checkpoint must be different files.', err=True, fg='red')
             sys.exit(1)