@Override
	public float get(long timestamp) {
		if (cachedHigherTs != -1) {
			if (timestamp < cachedHigherTs) {
				return cachedVal;
			}
		}
		Entry<Long, Float> result = samples.floorEntry(timestamp);
		Entry<Long, Float> higher = samples.higherEntry(timestamp);

		if (result == null) {
			cachedVal = 0.0f;
		} else {
			cachedVal = result.getValue();
		}

		if (higher == null) {
			cachedHigherTs = Long.MAX_VALUE;
		} else {
			cachedHigherTs = higher.getKey();
		}
		return cachedVal;
	}



==========
	@Override
	public float get(long timestamp) {
		return getFloor(timestamp);
	}