title: unable to convert yaml string to map with key "NO" in java
body: <p>While I am trying to convert yaml string to Map I am getting key change.<br>
  YAML File:-</p>
  
  <pre><code>---
  HK: 
    isp: 
      Airtel: AirtelChennal
    www.enemalta.com: 
      default: defaultEma
      user1: chennal1
    studiodefault: hkDefaultchennal
    country: 
      DK: denmarkChennal
      NO: chennal2
  </code></pre>
  
  <p>Java code:-</p>
  
  <pre><code>Yaml yaml= new Yaml();
  Map&lt;String,Object&gt; map= (Map&lt;String, Object&gt;) yaml.load(yamlString);
  </code></pre>
  
  <p>output :-</p>
  
  <pre><code>{HK={isp={Airtel=AirtelChennal}, www.enemalta.com={default=defaultEma, user1=chennal1}, studiodefault=hkDefaultchennal, country={DK=denmarkChennal, false=chennal2}}}
  </code></pre>
  
  <p>in above output false is replace with "NO", but I need "NO" as it is.</p>
  
  <p>Expected output:-</p>
  
  <pre><code>{HK={isp={Airtel=AirtelChennal}, www.enemalta.com={default=defaultEma, user1=chennal1}, studiodefault=hkDefaultchennal, country={DK=denmarkChennal, NO=chennal2}}}
  </code></pre>