Should we compare floating point numbers for equality against a *relative* error?

Question

So far I\'ve seen many posts dealing with equality of floating point numbers. The standard answer to a question like \"how should we decide if x and y are equal?\" is

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Answer 1

As an alternative solution, why not just round or truncate the numbers and then make a straight comparison? By setting the number of significant digits in advance, you can be certain of the accuracy within that bound.