Objects instantiated from es6 Classes throw error `E_INVALID_RECORD` in `create` method

**Sails version**: 1.0.1
**Node version**: 8.11.1
**NPM version**: 5.6.0
**DB adapter name**: sails-disk
**DB adapter version**: 1.0.0-12
**Operating system**: Ubuntu 17.10

So, I have few helper database classes that I use to keep the sanctity of the database instanct.

Here's one such class

```
class BookingRequest {
constructor({person, date, slot, partner}){
this.person = person;
this.date = date;
this.slot = slot;
this.partner = partner;
}
}
```
And here's my data model

```
module.exports = {
tableName: 'reservations',
attributes: {
person: {
type: 'string',
required: true
},
date: {
type: 'number',
required: true
},
slot: {
type: 'string',
required: true
},
partner: {
model: 'user',
required: true
}
},
};
```
And here's how I putting it all together:

```
const doc = new BookingRequest(req.body);
const createdBooking = await Reservation.create(doc).fetch();
```
And this throws error:
```
Failed process the values set for the record
```
The error code is:: `E_INVALID_RECORD`

But here's an interesting thing, I made it work with this hack,
```
const doc = new BookingRequest(req.bdoy);
const createdBooking = await Reservation.create(JSON.parse(JSON.stringify(doc))).fetch();
```
Now, I can't understand why it doesn't work without the hack.

Start at the Reservation.create entry point and reproduce the difference between passing the BookingRequest instance and the JSON-cloned object. Trace where the record values are validated and compare the resulting E_INVALID_RECORD details; done means the class-instance behavior has a confirmed, tested outcome or a clearly documented limitation.

Written by the indexing model from the issue text.