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Editorial: Update IEEE 754 standard version #1770
To the contrary, the observable behavior is the fact that the reference has updated with no change, signaling to readers that the spec is and was compatible with both versions. Otherwise, someone could ask themselves “wait, why the old standard?” and spend some amount of time finding the answer.
(An example of that not happening is the C++ normative reference to ES3, where it is not updated because it isn’t compatible with later versions.)
What do you think about normatively referencing the 2019 standard, and then providing a "conformance note" (those words) that a 2008 conformant implementation is also acceptable?
Whether or not that extends to say something along the lines of "there are no normative changes between IEEE-754:2008 and IEEE-754:2019 that affect the ECMA-262 specification" is up to the editors.