code: public Filters withKeyUsage(String... keyUsage) {
          if (this.keyUsage == null) {
              setKeyUsage(new java.util.ArrayList<String>(keyUsage.length));
          }
          for (String ele : keyUsage) {
              this.keyUsage.add(ele);
          }
          return this;
      }
docs: <p>
  Specify one or more <a>KeyUsage</a> extension values.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setKeyUsage(java.util.Collection)} or {@link #withKeyUsage(java.util.Collection)} if you want to override
  the existing values.
  </p>
  
  @param keyUsage
  Specify one or more <a>KeyUsage</a> extension values.
  @return Returns a reference to this object so that method calls can be chained together.
  @see KeyUsageName