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Nothing is rounded internally. It is just the default setting for number display is 6-digits. You can change that default in the Preferences panel. Select the Numbers and Formatting tabs in the Appearance panel. Use the Displayed Precision edit field.


Amplifying on Algohi's answer Table[{ x = SetPrecision[0.0000000000000000036, n], Precision[x], 1 - x, Precision[1 - x]}, {n, 10}] // Grid


x = SetPrecision[0.0000000000000000036, 1]; y = 1 - x (*0.9999999999999999964*)

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