fails:Encoding.list returns an Array
fails:Encoding.list returns an Array of Encoding objects
fails:Encoding.list returns each encoding only once
fails:Encoding.list includes the default external encoding
fails:Encoding.list does not include any alias names
fails:Encoding.list includes all aliased encodings
fails:Encoding.list includes dummy encodings
fails:Encoding.list updates the list when #find is used to load a new encoding
