Description:
------------
yaml.decode_timestamp is said to 'Controls the decoding of both implicit and explict "tag:yaml.org,2002:timestamp" scalars.' This seems to be covered by the resolution rules(http://yaml.org/spec/1.1/current.html#id866224)

However this settings decodes all scalars which is not recommended. (http://yaml.org/spec/1.1/current.html#id866262). Nodes have “!” non-specific tag shouldn't be resolved. Quoted tags are documented as being treated the same way



Test script:
---------------
<?php
ini_set('yaml.decode_timestamp', 1);
var_dump(yaml_parse('
date1: 2015-05-15
date2: "2015-05-15"
date3: ! 2015-05-15
'));


Expected result:
----------------
array(3) {
  ["date"]=>
  int(1431666000)
  ["date2"]=>
  string(10) "2015-05-15"
  ["date3"]=>
  string(10) "2015-05-15"
}


Actual result:
--------------
array(3) {
  ["date"]=>
  int(1431666000)
  ["date2"]=>
  int(1431666000)
  ["date3"]=>
  int(1431666000)
}