Binary operator in level 67 is sometimes slightly inaccurate

[tricosahedron]

From what I can tell, the binary operator in level 67 is supposed to calculate log(x)/log(y) = log_y(x) = 1/log_x(y), where x and y are the parameters, and log_b(x) is the logarithm of x to base b.

However, if the first operator is 3 and the second is 9, the result is 0.499999, when it should be log3/log9 = 1/log_3(9) = 1/2 = 0.5.

Using the above result with the unary operator which should represent 2-4x yields 0.000003, when it should be 0.

The level can still be solved without any issues, but those inaccuracies confused me (and might prevent viable alternative solutions).