BUG: interpolate: integral(a, b) should be zero when both limits are outside of the interpolation range #10633
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Integrals should be zero when both limits are outside of the interpolation range
fixes gh-7906
The bug was that FITPACK moves the out-of-range upper limit of integration to the upper bound of the base interval, and the out-of-range lower limit to the lower bound. This way, if both limits are, say, above the upper bound, the lower limit stays above it, and the computational routine goes haywire.