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disable /feed/ for custom post type

Our custom post type posts have an extra feed in their source code:

www.example/post-type/post/feed/

I want to remove the extra /feed/ from our CPTs, as they generate 404s.

From the register_post_type function reference, I’ve tried adding 'rewrite' => array('feeds' => null), to:

register_post_type('templates',
    array(
    'labels' => array(
            'name' => __( 'Templates' ),
            'singular_name' => __( 'Template' ),
            'add_new' => __( 'Add New' ),
            'add_new_item' => __( 'Add New Template' ),
            'edit' => __( 'Edit' ),
            'edit_item' => __( 'Edit Template' ),
            'new_item' => __( 'New Template' ),
            'view' => __( 'View Template' ),
            'view_item' => __( 'View Template' ),
            'search_items' => __( 'Search Templates' ),
            'not_found' => __( 'No Templates found' ),
            'not_found_in_trash' => __( 'No Templates found in Trash' ),
            'parent' => __( 'Parent Templates' ),
        ),
      'public' => true,
      'show_ui' => true,
      'exclude_from_search' => true,
      'hierarchical' => true,
      'supports' => array( 'title', 'editor', 'thumbnail','page-attributes' ),
      'rewrite' => array('feeds' => false),
      'query_var' => true
    )
  );
}

but this has not resolved the issue.

Help appreciated.