Joi: New option to allow unknown key but remove it by `validate`

[longweiquan]

Context

• _node version_: 6.2.0
• _joi version_: 8.0.1
• _environment_ (node, browser): node
• _used with_ (hapi, standalone, ...): standalone
• _any other relevant information_:
  

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

I hope that joi provide a new option of unknown to allow unknown attributes but remove it in the result.

const schema = Joi.object({
  a: joi.string()
}).unknown()
schema.validate({a:'1', b: '1'}, (err, result) => {
  // result = {a: '1', b: '1'}
})

Which result you had ?

the function validate will leave the unknown attributes in the object.

What did you expect ?

A new option of unknown to allow unknown key but remove it in the result

[Marsup]

You can already do that with .options({ stripUnknown: true }). Be aware it propagates to children schemas in case you have objects or arrays inside.

[longweiquan]

@Marsup,

It works for me with this option, for instance I don't need the isolation in different hierarchy. Thank you very much. I will close this issue.

[lock[bot]]

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