Yes, that is expected.
The approxRational calculation is based on x+eps and x-eps, which is
1%100 and 3689348814741910323%20 in your example, and the last one is
due to the fact that there are no negative numbers in word and there
is a silent underflow. (similar to: (0::Word)-1).
And the simplest rational number between these two is 1.
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