delete_post_meta only removes 5 most recent entries

  • I am creating an uninstall file for a small WordPress plugin i wrote.
    I want to remove the entries I added in the wp_postmeta table.
    I use the following code for it as describet in the codex:

    $allposts = get_posts('numberposts=0&post_type=post&post_status=');
foreach( $allposts as $postinfo) {
	delete_post_meta($postinfo->ID, '_myPluginName');
}

    But it only deletes the entries from the 5 most recent posts (the other data stays just in the database).

    When I ‘prinr()’ the $allposts, I also get only the data from the 5 most recent post.

    How can I fix it?

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