core/merge function does not handle certain cases

[magom001]

Environment

Paste here

Reproduction URL

n/a

Describe the issue

Given the target

const target = {
      sessionToken: {
        name: "authjs.session-token",
        options: {
          httpOnly: true,
          sameSite: "lax",
          path: "/",
          secure: false,
        },
      }
    }

And the source

const source = {
      sessionToken: {
        options: {
          expires: new Date("2024-01-01T00:00:00Z"),
        },
      }
    }

I expect to get:

    const expected = {
      sessionToken: {
        name: "authjs.session-token",
        options: {
          httpOnly: true,
          sameSite: "lax",
          path: "/",
          secure: false,
          expires: source.sessionToken.options.expires,
        },
      }
    }

Actual result:

 Object {
    "sessionToken": Object {
      "name": "authjs.session-token",
      "options": Object {
-       "expires": 2024-01-01T00:00:00.000Z,
+       "expires": Object {},
        "httpOnly": true,
        "path": "/",
        "sameSite": "lax",
        "secure": false,
      },
    },
  }

How to reproduce

I have a PR: #13030

Added a unit test for the case descibed in the issue. The original implementation failed as described.

Expected behavior

See the description

[github-actions]

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Useful Resources

• How to create a Minimal, Complete, and Verifiable example
• Bug report: Framework
• Bug report: Provider
• Bug report: Adapter