fix: prevent crash when BigInt passed to res.status()

[theaniketgiri]

Fixes #6756

Previously, passing a BigInt to res.status() would cause an uncaught TypeError because JSON.stringify() cannot serialize BigInt values. The error occurred when trying to create the error message.

Changes:

• Replace JSON.stringify(code) with template literal and typeof
• Error message now shows both the value and its type
• Add comprehensive tests for BigInt and other invalid types

[krzysdz]

This is a duplicate of #6848, with the same approach.

[theaniketgiri]

This is a duplicate of #6848, with the same approach.

Thanks for pointing out the Object.create(null) edge case!

I've updated this PR to handle it properly. The fix now uses:

• Object.prototype.toString.call(code) for objects (handles null-prototype objects safely)
• String(code) for primitives (handles BigInt correctly)

Added a test case specifically for Object.create(null) to verify the fix.

All 13 tests pass

[vpn-game]

dashboard.html

pls sum one solve error 🙏🙏

[jonchurch]

There's no crash here. Im sorry but misunderstanding the problem you're attempting to solve is a close from me.