With in Eloquent/Builder fails when passing callback as null instead of calling it with only relations. #61762

Laravel Version

12 and 13

PHP Version

8.4

Database Driver & Version

No response

Description

When calling $Builder->with($relations, null) explicitly func_get_args() incorrectly interprets null as 0 if $relations is a string. We had this because we extended the builder and had a with($relations, $callback = null) signature ourselves which called parent::with($relations, $callback), thus passing the null generated from our own default, instead of letting the parent generate its null default.

Steps To Reproduce

Call any builder::with() method with a string in relations and null passed explicitly to callback instead of defaulting to null.