*gawk:* Inexactness of computations

15.4.1 Floating-Point Arithmetic Is Not Exact
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Binary floating-point representations and arithmetic are inexact.
Simple values like 0.1 cannot be precisely represented using binary
floating-point numbers, and the limited precision of floating-point
numbers means that slight changes in the order of operations or the
precision of intermediate storage can change the result. To make
matters worse, with arbitrary-precision floating-point arithmetic, you
can set the precision before starting a computation, but then you cannot
be sure of the number of significant decimal places in the final result.

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