Join on nullable and not nullable type throws exception

[ghost]

A join on a nullable type with a not nullable type works in a normal Linqquery:

var realQuery = people.AsQueryable().Join(
                pets,
                person => person.Id,
                pet => pet.NullableOwnerId,
                (person, pet) => new { OwnerName = person.Name, Pet = pet.Name });

But the same with dynamic linq throws an exception:

var dynamicQuery = people.AsQueryable().Join(
                pets,
                "it.Id",
                "NullableOwnerId",
"new(outer.Name as OwnerName, inner.Name as Pet)");

I think it does this because the types do not match?

I forked this repo and wrote a unittest which fails. Check this commit for the complete test.