Currently, using remember_me.signature_properties on a property holding an enum fails with:

The property path "status" on the user object "App\Security\SecurityUser" must return a value that can be cast to a string, but "App(...)\UserStatus" was returned.

We can add support for enums in one of three ways:

1. support all enums, and use the enum case name
2. support only backed enums, and use the enum case backing value (int|string)
3. support all enums, and use enum case name + backing value if available (most sensitive to changes)

In the current PR I went with option 2, but I'm thinking that option 3 could be better:

Pros:

• it would support all enums
• it would detect changes such as exchanging values of 2 enum cases

Cons:

• it would invalidate the token if an enum case is renamed

I would welcome feedback here.