Although `toString` method is exposed from the library, it's not referring the actual implementation.

[NithishG]

• Either we need to import the toString from lib/util/toString so that the exported method will refer to the actual implementation.
• Or we need to remove toString export from the lib altogether.

The reason behind is as toString is exposed, so when we call validator.toString("test") it's resulting [object Object].

[gbcreation]

Please, expose its implementation.