Ajax broken by WordPress warnings: solve trough ob_start()?

I am writing a plugin for WordPress. My goal is make it work for everyone. Some pages use ajax responses. Some users have activated the WP_DEBUG constant that shows errors and warnings from themes and other plugins.

This breaks my Ajax PHPs because I include the WordPress Core, and then WP can show warnings in some blogs!

The old way I solved this, is:

<?php
ob_start();
//The wordpress core require
ob_end_clean();

//Now the ajax response:
echo '0';
?>

However, one user reported a very strange bug: the ajax page never response, only works in Opera, and Google Chrome says: Error 330 (net::ERR_CONTENT_DECODING_FAILED):

Digging in the user web-server, I found that WP configuration, or a plugin or elsewere uses the ob_start(“ob gzhandler”).

The ob_get_status(true) shows in my working webserver:

Array
(
    [0] => Array
        (
            [chunk_size] => 4096
            [type] => 1
            [status] => 0
            [name] => default output handler
            [del] => 1
        )

    [1] => Array
        (
            [chunk_size] => 0
            [size] => 40960
            [block_size] => 10240
            [type] => 1
            [status] => 0
            [name] => default output handler
            [del] => 1
        )

)

And in the buggy web-server:

Array
(
    [0] => Array
        (
            [chunk_size] => 4096
            [type] => 1
            [status] => 0
            [name] => default output handler
            [del] => 1
        )

    [1] => Array
        (
            [chunk_size] => 0
            [size] => 40960
            [block_size] => 10240
            [type] => 1
            [status] => 0
            [name] => default output handler
            [del] => 1
        )

    [2] => Array
        (
            [chunk_size] => 0
            [size] => 40960
            [block_size] => 10240
            [type] => 1
            [status] => 0
            [name] => ob_gzhandler
            [del] => 1
        )

)

The sequence in my user web-server is:

• My code calls ob_start()
• Include WP core, WP initializes all and call ob_start(“ob gzhandler”)
• When my code call ob_end_clean() it fails.

I need a safe way to hide the WP warnings, but I can’t break GZIP enabled configurations ( some plugin I suspect). If is not possible I prefer leave breaking ajax in warning systems and forget the buffer method.

I think a clean way may be:

$buffers = count(ob_get_status(true));
ob_start();
//The wordpress core require
if (count(ob_get_status(true)) == $buffers + 1) {
ob_end_clean();
} else {
ob_flush();
}
//Now the ajax response:
echo '0';

But I’m afraid some of the infinite combinations through PHP versions and configs, WP versions, plugins and configurations breaks somebody. What do you think is a good way to solve this problem?