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A contact of the current user that is registered in the system.
  Attributes:
| Name | Type | Required | Description | 
|---|
| user_id | long | Yes | User identifier | 
| mutual | Bool | Yes | Current user is in the user’s contact list | 
  Example:
 $contact = ['_' => 'contact', 'user_id' => long, 'mutual' => Bool];