[Core] Fixed the calculation of the table's derivative outside its domain #12477
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📝 Description
When the derivative of a table was requested at a point outside of the table's domain, it always returned 0. This was inconsistent with the behavior of member
GetValue
, which extrapolates using either the first line segment or the last line segment. The calculation of the table's derivative has been made consistent now. The change is covered by a unit test.