Iterative BS

Subtype of Build Method

Iterative bootstrap is needed when a non-local interpolation (such as cubic splines) is used.
In this case, setting the value of a node modifies the whole curve, invalidating previous nodes.
Therefore, we must go over the nodes a number of times until convergence is reached.
The specification details of this method can be optionally customized by supplying an object of type
Iterative Bootstrap as value to the key Bootstrap Spec