fails:Encoding.compatible? Object, Object returns nil for Object, String
fails:Encoding.compatible? Object, Object returns nil for Object, Regexp
fails:Encoding.compatible? Object, Object returns nil for Object, Symbol
fails:Encoding.compatible? Object, Object returns nil for String, Object
fails:Encoding.compatible? Object, Object returns nil for Regexp, Object
fails:Encoding.compatible? Object, Object returns nil for Symbol, Object
