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Credit_Curve__Build_MethodBuild Method refers to List of possible types that describe the particular methodology employed to build the curve.
Available Build Method types:
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.