1 2 3 4 5 6 7 8 9 10
+STR +DOC +SEQ =VAL &a <tag:yaml.org,2002:str> :a =VAL <tag:yaml.org,2002:int> :2 =VAL &c <tag:yaml.org,2002:int> :4 =VAL &d :d -SEQ -DOC -STR