For the API object.type(). I'm extending the meta data storage of the constructor within the schema to be placed in options. Also extending any.describe() to project it to a new item schema within the rules array. This will help facilitate an object generation of the exact type specified by this API contract. Problem right now is that the type is translated to a name of type String and the ability to reproduce via Object.create() is lost since there is no way to cast it back to the original reference. Support is being added within felicity

Let me know if there is a better way of implementing this.

Using the Joi API

Joi.object().type(RegExp);

Storage within the schema

{
    _test: [{
        name: 'type',
        arg: 'RegExp',
        options: {
            ctor: [Function RegExp]  //This is new
        }
    }]
}

Within the Transform of any.describe()

{
    rules: [{
        name: 'type',
        arg: 'RegExp',
        ctor: [Function RegExp] //This is new
    }]
}