cleanup: drop the `bytes` compatibility for attribute related function
We can rely on the builtins directly now.
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YOU MUST CHANGE ALL GUIDs below when copying this file
and replace 'Mercurial' in this notice with the name of
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<?define ProductUpgradeCode = {A1CC6134-E945-4399-BE36-EB0017FDF7CF} ?>
<?define ComponentMainExecutableGUID = {D102B8FA-059B-4ACC-9FA3-8C78C3B58EEF} ?>
<?define ProgramMenuDir.guid = {D5A63320-1238-489B-B68B-CF053E9577CA} ?>
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