Array default ignored: array default always = []

[anthonyG78]

According to the Mongoose arrays documentation, an array default value is possible.
But in schm, when array of schema is validatate, the default value is always an empty array.

Inspired example from Mongoose

const ToySchema = schm({ name: String });
const ToyBoxSchema = schm({
  toys: {
    type: [ToySchema],
    default: undefined
  },
  buffers: [Buffer],
  strings: [String],
  numbers: [Number]
});

const result = await ToyBoxSchema.validate({
  // Validate empty object
});

console.log(result); 
// result = { toys: [], buffers: [], strings: [], numbers: [] }
// Expected: result =  { toys: undefined, buffers: [], strings: [], numbers: [] }

Any idea to get a custom default value rather than an empty array?
Thx