Fixtures and schema merging

fixture.js

let RelativeDate = {
  [Symbol.for("can.new")](value) {
    if( date === "yesterday" ) {
        return new Date()- 1000*24
    }
    return date;
  },
  [Symbol.for("can.isMember")](value) {
    return value instanceof Date;
  }
};
  
let currentSchema = canReflect.getSchema(type.convertAll(Todo));
let schema = {
  ...currentSchema,
  
  keys: {
    ...currentSchema.keys,
    dueDate: RelativeDate
  }
};

fixture.store(items, schema);