[Bug]: Fauxton silently corrupts integers larger than `Number.MAX_SAFE_INTEGER`

[mhehle]

Version

3.3.3

Describe the problem you're encountering

Documents containing integers larger than JavaScript Number.MAX_SAFE_INTEGER are stored correctly by CouchDB itself.

However, when such a document is opened and saved through the Fauxton Web UI, the integer is silently rounded/truncated due to JavaScript number precision limits, corrupting the document.

Expected Behaviour

The integer value should remain unchanged after editing/saving via Fauxton.

Steps to Reproduce

1. Insert a document containing a large integer:

{
  "_id": "large-int-test",
  "hugeNumber": 9223372036854775807
}

2. Open the document in Fauxton.
3. Save the document.
4. Fetch the document again.

Actual Result

{
  "_id": "large-int-test",
  "_rev": "1-242234d64bf45499ef1d622e1a0f8237",
  "hugeNumber": 9223372036854776000
}

Your Environment

No response

Additional Context

No response