code: public float[] getFloatArray(final String key, final float[] def) {
  		try {
  			final float[] result = getFloatArray(key);
  			return result != null ? result : def;
  		} catch (final NumberFormatException nfe) {
  			return def;
  		}
  	}
docs: Gets the prefixed key and parse it to an float[]<br>
  Each comma-separated list can be used. If the key couldn't get found, the
  default will be used.
  
  @param key
  the key
  @param def
  default value
  
  @return float[]