truthy() / falsy() values apply when convert is false

[kanongil]

Context

• node version: n/a
• joi version: current
• environment (node, browser): n/a
• used with (hapi, standalone, ...): standalone
• any other relevant information:

There is an internal inconsistency, where the convert options does not apply to truthy() / falsy() values, but does apply to the built-in "true" / "false".

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

const schema = Joi.boolean().truthy('y');

Joi.validate('true', schema, { convert: false }); // returns ValidationError

Joi.validate('y', schema, { convert: false }); // => returns `value: true`