Documented duplicates option not recognized

[fredrik-bakke]

The configuration --duplicates doi, key is documented to work, but throws the following error:

Unknown option: --duplicates doi, key
Try 'bibtex-tidy --help for more information.

[fredrik-bakke]

Also, I suppose the error message is ill-formatted and should have said

Unknown option: --duplicates doi, key
Try 'bibtex-tidy --help' for more information.

with a closing ' after --help.