特殊情况:
Nextafter(x, x) = x
Nextafter(NaN, y) = NaN
Nextafter(x, NaN) = NaN
<iframe style="border:1px solid" src="https://wide.b3log.org/playground/954a603f4febf60ccb6e8525f2387790.go?embed=true" width="99%" height="600"></iframe>
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