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[3.11] gh-106498: Revert incorrect colorsys.rgb_to_hls change (GH-106627) - #106633
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…H-106627) pythongh-86618 assumed a-b-c = a-(b+c) = a-d where d = b+d. For floats 2.0, 1.0, and 0.9999999999999999, this assumption is false. The net change of 1.1102230246251565e-16 to 0.0 results in division by 0. Revert the replacement. Add test. (cherry picked from commit a2d54d4) Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
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gh-86618 assumed a-b-c = a-(b+c) = a-d where d = b+d.
For floats 2.0, 1.0, and 0.9999999999999999, this assumption
is false. The net change of 1.1102230246251565e-16 to 0.0
results in division by 0. Revert the replacement. Add test.
(cherry picked from commit a2d54d4)
Co-authored-by: Terry Jan Reedy tjreedy@udel.edu