code: public JSONArray put(int index, float value) throws JSONException {
          return this.put(index, Float.valueOf(value));
      }
docs: Put or replace a float value. If the index is greater than the length of
  the JSONArray, then null elements will be added as necessary to pad it
  out.
  
  @param index
  The subscript.
  @param value
  A float value.
  @return this.
  @throws JSONException
  If the index is negative or if the value is non-finite.