Informative fails when it defines a single button

[mimosinnet]

Thanks for the module. I use it in my scripts. I have noticed that Informative fails when it defines a single button. Example:

This command;
inform( 'Test a single button', :buttons( OK => 'OK') );
fails with
failed in binding to parameter '@buttons'; expected Positional but got Pair (:OK("OK"))

This command works:
inform( 'Test a single button', :buttons( OK => 'OK',) );

Thanks!