Custom fields with serialize

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Hello, My custom fileds are all PHP serialize type (array), as Wordpress array metadata by default. Because of it, i have founded a issue in your code. The cfr_insert_meta method was saving arrays as strings, and the unserialize method couldn't work after charge a revision version of the post. To fix the issue, i have made a customization in your cfr_insert_meta method, see bellow:

<?php
function cfr_insert_meta($post_id, $meta) {
    foreach ($meta as $meta_key => $meta_value) {
        if (is_array($meta_value))
            foreach ($meta_value as $single_meta_value)
                add_metadata('post', $post_id, $meta_key, unserialize($single_meta_value));
        else
            add_metadata('post', $post_id, $meta_key, $meta_value);
    }
}

I have added the unserialize method inside your foreach because add_metadata method always save array into serialize by default.

Congrats for the amazing plug-in. It made my day easier.