[Webkit-unassigned] [Bug 243411] New: Preserve NaN mantissa

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=243411

            Bug ID: 243411
           Summary: Preserve NaN mantissa
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dev at sheetjs.com

```js
var u = new Uint8Array(new Float64Array([NaN]).buffer)
u[1] = 1;
console.log(u);
var nu = new Uint8Array(new Float64Array([new Float64Array(u.buffer)[0]]).buffer)
console.log(nu);
```

Bun / Safari lose the nantissa in the process

```
Uint8Array(8) [ 0, 1, 0, 0, 0, 0, 248, 127 ]
Uint8Array(8) [ 0, 0, 0, 0, 0, 0, 248, 127 ] // Note that the 1 is lost
```

Node / Chrome preserve the nantissa:

```js
Uint8Array(8) [ 0, 1, 0, 0, 0, 0, 248, 127 ]
Uint8Array(8) [ 0, 1, 0, 0, 0, 0, 248, 127 ] // Note that the 1 is preserved
```

FWIW the note in 6.1.6, along with the paragraph preceding the note, seems to suggest that both behaviors are spec-compliant.

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