Description:
------------
According to the YAML 1.1 spec (http://yaml.org/spec/1.1/#non-specific%20tag/):

(1) During parsing, nodes that omit the tag are given a non-specific tag: ??? for plain scalars and ?!? for all other nodes
(2) It is recommended that nodes having the "!" non-specific tag should be resolved as "tag:yaml.org,2002:seq", "tag:yaml.org,2002:map" or "tag:yaml.org,2002:str" depending on the node?s kind

From what I can tell, the extension ignores the recommendations for resolving sequences and maps without an explicit tag, for both inline and block styles.

Reproduce code:
---------------
function tag_cb($tag,$obj,$style) { echo "Found tag $tag\n"; }

$yaml = <<<YAML
implicit_map:
  a: b
explicit_map: !!map
  c: d
implicit_seq: [e, f]
explicit_seq: !!seq [g, h]
YAML;

yaml_parse($yaml,0,$ndocs,array(YAML_MAP_TAG => 'tag_cb', YAML_SEQ_TAG => 'tag_cb'));


Expected result:
----------------
Found tag tag:yaml.org,2002:map //implicit
Found tag tag:yaml.org,2002:map //explicit
Found tag tag:yaml.org,2002:seq //implicit
Found tag tag:yaml.org,2002:seq //explicit

Actual result:
--------------
Found tag tag:yaml.org,2002:map //explicit
Found tag tag:yaml.org,2002:seq //explicit