code: public static DoubleBinding log1p(final ObservableDoubleValue x) {
          return createDoubleBinding(() -> Math.log1p(x.get()), x);
      }
docs: Binding for {@link java.lang.Math#log1p(double)}
  
  @param   x   a value
  @return the value ln({@code x}&nbsp;+&nbsp;1), the natural
  log of {@code x}&nbsp;+&nbsp;1