Context

• node version: 6.9
• joi version: 10.6.1

const schema = Joi.lazy(() => Joi.any()).once()

Since fn for Joi.lazy(fn) should return joi schema, it's okay to be called once to avoid unnecessary overhead.

(+) My other need is describing lazily-loaded schema with Joi.describe().
If lazy.once() replace the schema as lazily loaded schema itself, we can now describe the lazy schema as well. (Could it be another feature request for Joi.describe()? )