"deepScan" works with `null`

[Eswcvlad]

Following expressions do not throw TypeError, as expected from the spec text:

• deepScan(`null`, 0) -> []
• deepScan(`null`,"key") -> []

Maybe just add null to the type list?

[JohnBrinkman]

Agreed. The implementation allows null, but the docs don't. Will update the docs.