`InferSchemaType` returns `unknown` value about mongoose HOT 3 OPEN

export const UserSchema = new Schema({
	languages: [
		{
			name: SchemaTypes.String,
			spoken: SchemaTypes.Boolean,
		},
	],
	roles: [SchemaTypes.String],
});

export type IUser = InferSchemaType<typeof UserSchema>;

const a: IUser = {
	languages: [
		{
			name: 'English',
			spoken: true,
		},
	],
};

// Type '{ name: string; spoken: true; }' is not assignable to type 'Subdocument<ObjectId> & { name?: string | null | undefined; spoken?: boolean | null | undefined; }'.
//  Type '{ name: string; spoken: true; }' is missing the following properties from type 'Subdocument<ObjectId>': $isSingleNested, ownerDocument, parent, $parent, and 50 more.ts(2322)
// types.d.ts(63, 11): The expected type comes from property '0' which is declared here on type 'DocumentArray<{ name?: string | null | undefined; spoken?: boolean | null | undefined; }>'

a.roles.includes('a');
// Argument of type 'string' is not assignable to parameter of type 'Subdocument<ObjectId> & { get?: {} | null | undefined; set?: {} | null | undefined; prototype?: string | null | undefined; schemaName?: string | null | undefined; cast?: {} | ... 1 more ... | undefined; checkRequired?: {} | ... 1 more ... | undefined; }'.
//  Type 'string' is not assignable to type 'Subdocument<ObjectId>'.ts(2345)