Setting an <input> value to null is wrong

[raystubbs]

Describe the bug
Setting x.value = null, where x is an HTMLInputElement, results in a value with the string "null" instead of an empty string. All browsers I've tested (at least Chrome and Firefox) reset the value to an empty string when set to null.

To Reproduce
Steps to reproduce the behavior:

const x = document.createElement("input");
x.value = null;
// inspect x.value in the console, its value is "null"

Expected behavior
x.value should have an empty string instead of "null".

Additional context
happy-dom v15.8.0