Wakeup magic method.

Source

public function __wakeup() {
	if ( ! $this->sources ) {
		return;
	}
	if ( ! is_array( $this->sources ) ) {
		throw new UnexpectedValueException();
	}
	foreach ( $this->sources as $value ) {
		if ( ! $value instanceof WP_Block_Bindings_Source ) {
			throw new UnexpectedValueException();
		}
	}
}

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