public static class Ext
{
	private static IEnumerable<decimal> LinearInterpolate(decimal lowerBound, decimal upperBound, int pointCount)
	{
		var gradient = (upperBound - lowerBound) / (pointCount + 1);
		for(var i = 1; i <= pointCount; i++)
		{
			yield return lowerBound + gradient * i;
		}
	}

	public static IEnumerable<decimal> Interpolate(this IEnumerable<decimal> original)
	{
		var zeroCount = 0;
		var previousValue = 0m;
		var enumerator = original.GetEnumerator();

		// Strip leading 0s
		while(enumerator.MoveNext())
		{
			if(enumerator.Current == 0)
			{
				yield return 0;
			}
			else
			{
				previousValue = enumerator.Current;
				yield return enumerator.Current;
				break;
			}
		}

		// Interpolate 0s
		while(enumerator.MoveNext())
		{
			if(enumerator.Current == 0)
			{
				zeroCount++;
			}
			else
			{
				if(zeroCount > 0)
				{
					foreach(var item in LinearInterpolate(previousValue, enumerator.Current, zeroCount))
					{
						yield return item;
					}
					zeroCount = 0;
				}
				yield return enumerator.Current;
				previousValue = enumerator.Current;
			}
		}

		// Strip trailing 0s
		for (var i = 0; i < zeroCount; i++)
		{
			yield return 0;
		}
	}
}