Issue with PluralizationServices (c#)

Question

I was just playing with System.Data.Entity.Design.PluralizationServices.PluralizationService.

Have you experienced issues with this function?

If I have a string var with value "ducks" and run

string noun = "ducks";

noun = System.Data.Entity.Design.PluralizationServices.PluralizationService.CreateService(System.Globalization.CultureInfo.CurrentUICulture).Singularize(noun);

I still get the plural.

Yet if I do the same with a literal string it works as expected.

string noun = string.Empty;

noun = System.Data.Entity.Design.PluralizationServices.PluralizationService.CreateService(System.Globalization.CultureInfo.CurrentUICulture).Singularize("ducks");