Tokens should implement IComparable and IEquatable

[mthalman]

This will make it more useful for comparisons and dictionary lookups.

[mthalman]

Given that tokens are mutable, it is not recommended to override GetHashCode. That prevents the dictionary lookup scenario from being a target. Instead, if the consumer knows what they're doing and knows that the token will not change, they can easily implement a simple IEqualityComparer that could be used to provide dictionary lookup by value.

The comparison scenario isn't very compelling. Closing for now.