Revised (untested) map method for class-mapper.php: https://github.com/mediasilo/vulture/blob/master/inc/class-mapper.php#L60-L61

class-mapper.php

<?php

	private function map( $entity, $model ) {
        $mapped = $entity;

        foreach ( $entity as $key => $value ) {
            if ( is_object( $entity ) ) {
                if ( is_object( $value ) || is_array( $value ) )
                    $mapped->$key = $this->map( $value, $model );
                else if ( property_exists( $model, $value ) )
                    $mapped->$key = $this->translate( $value, $model->$value );
            }
            else if ( is_array( $entity ) ) {
                if ( is_object( $value ) || is_array( $value ) )
                    $mapped[$key] = $this->map( $value, $model );
                else if ( property_exists( $model, $value ) ) {
                    if (isset($mapped[$key]))
                        $mapped[$key][] = $this->translate( $value, $model->$value );
                    else
                        $mapped[$key] = $this->translate( $value, $model->$value );
                }
            }
        }

        return $mapped;
    }