similar to issue https://jira.mongodb.org/browse/GODRIVER-1235

However, if the json document contains a field that is not defined in the struct and that field happens to be an array, the Skip() call on line 284 os struct_codec.go reads all the way to the end of document (EOD) and the DecodeValue() returns, it doesn't continue parsing the other fields in the document.  Attached is a series of tests that show the behavior.  I don't see any struct flags and or other flags to change this behavior. 

If an undefined field is a primitive (string, int, etc), the parser works fine.  If the  undefined field is another struct/map the parser works fine.