return (NavigableMap<K, V>) map;
    }

    @Override
    public @Nullable K lower(@ParametricNullness K e) {
      return map().lowerKey(e);
    }

    @Override
    public @Nullable K floor(@ParametricNullness K e) {
      return map().floorKey(e);
    }

    @Override
    public @Nullable K ceiling(@ParametricNullness K e) {
      return map().ceilingKey(e);
    }

    @Override

        `tf.acosh`, `tf.add`, `tf.as_string`, `tf.asin`, `tf.asinh`, `tf.atan`,
        `tf.atan2`, `tf.atanh`, `tf.cos`, `tf.cosh`, `tf.equal`, `tf.exp`,
        `tf.floor`, `tf.greater`, `tf.greater_equal`, `tf.less`,
        `tf.less_equal`, `tf.log`, `tf.logp1`, `tf.logical_and`,
        `tf.logical_not`, `tf.logical_or`, `tf.maximum`, `tf.minimum`,

pkg math, func Float32bits(float32) uint32
pkg math, func Float32frombits(uint32) float32
pkg math, func Float64bits(float64) uint64
pkg math, func Float64frombits(uint64) float64
pkg math, func Floor(float64) float64
pkg math, func Frexp(float64) (float64, int)
pkg math, func Gamma(float64) float64
pkg math, func Hypot(float64, float64) float64
pkg math, func Ilogb(float64) int
pkg math, func Inf(int) float64