code: public boolean getBoolean(final String key, final boolean def) {
          Object foo = get(key);
          if (foo == null) {
              return def;
          }
          if (foo instanceof Number) {
              return ((Number) foo).intValue() > 0;
          }
          if (foo instanceof Boolean) {
              return (Boolean) foo;
          }
          throw new IllegalArgumentException("can't coerce to bool:" + foo.getClass());
      }
docs: Returns the value of a field as a boolean
  
  @param key the field to look up
  @param def the default value in case the field is not found
  @return the value of the field, converted to a string