## message with a 'name' header field and unknown 'unkn' field

## VALID_HEADER includes a LENGTH Header and LENGTH Body
VALID_HEADER method_call
REQUIRED_FIELDS

HEADER_FIELD UNKNOWN
TYPE DICT
LENGTH Dict
START_LENGTH Dict
STRING 'int32'
TYPE INT32
INT32 0x12345678
END_LENGTH Dict

ALIGN 8
END_LENGTH Header
START_LENGTH Body
END_LENGTH Body
