interpolation_coefficients has been changed to get Decimal values while interpolation_formula still gets float values.

interpolation_coefficients has to be provided by user code for tests to work, but it does the same thing as interpolation_formula. The latter only does the formatting. So wha are we being tested two almost identical functions?

i dont understand what following lines mean in examples:
(0.52 > 0.48) => [485, 431] and 485 + 431 = 916 and (0.8 > 0.6 > 0.4 > 0.2) => [0, 1, 1, 0] and 0 + 1 + 1 + 0 = 2.

What does (a > b > c ) mean, exactly, and how it applies to the task? What is [ 0, 1, 1, 0 ] in the second example?

This issue is not fixed.