Context

• node version: 6.11.4
• joi version: 13.0.0
• environment: browser
• used with: react, redux-form

What are you trying to achieve or the steps to reproduce ?

Hi. I found that via options impossible to disable language.key. I've tried to put false and empty string. As a workaround string with one space works. But seems like it is not ok and looks weird.

const schema = Joi.object().keys({
  domain: Joi.string()
    .alphanum()
    .required()
    .options({
      language: {
        // key: false, - not working
        // key: '', - not working
        key: ' ', // works
        string: { alphanum: 'check the spelling of your {{label}} domain and try again' },
      },
    }),
});

What did you expect ?

Ability to disable language.key with false or something like that.