Integrate a Function with at Most Finite Number of Discontinuities *EXPERIMENTAL*
The function uses multiple calls to integrate.
integrate_discont_val(f, from, to, discontinuities = numeric(0), ...)
| f | an R function taking a numeric vector of length 1 as its first argument and returning a numeric vector of length 1 | 
| from | the lower limit of integration | 
| to | the upper limit of integration | 
| discontinuities | nondecreasingly sorted numeric vector which indicates
the points at which  | 
| ... | further arguments to be passed to the  | 
Returns the estimate of the integral.
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