joi.bind yields any() methods not fully bound

[shellscape]

Context

• node version: 10.13.0
• joi version: 14.3.0
• environment (node, browser): Node
• used with (hapi, standalone, ...): standalone
• any other relevant information:

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

When using joi.bind(), methods are returned as part of the resulting object which are not fully bound and cause subsequent errors:

const { allow, object, validate } = Joi.bind();
const schema = object().keys({
  a: [allow(null)]
});
const o = { a: 0 };

console.log(validate(o, schema));

The allow method exists on the bound object, but is not bound properly, as the error below is generated. To work around the issue, we must use allow directly from any, which is not the optimal solution.

const { any, object, validate } = Joi.bind();
const schema = object().keys({
  a: [any().allow(null)]
});
const o = { a: 0 };

console.log(validate(o, schema));

Which result you had ?

/code/webpack/webpack-plugin-serve/node_modules/joi/lib/types/any/index.js:301
        const obj = this.clone();
                         ^

TypeError: Cannot read property 'clone' of undefined
    at allow (/code/webpack/webpack-plugin-serve/node_modules/joi/lib/types/any/index.js:301:26)
    at Object.<anonymous> (/code/webpack/webpack-plugin-serve/s.js:28:7)

What did you expect ?

{ error: null,
  value: { a: 0 },
  then: [Function: then],
  catch: [Function: catch] }

[shellscape]

Thanks for jumping on this so quickly!

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