`SmartEnumNameConverter` does not support `Guid` values

I am using SmartEnums with Guid's as underlying values.
This works great except for when I want to serialize the names to JSON. In `SmartEnumNameConverter` there is a restriction placed on `TValue`, specifically `IConvertible`.
When I add a copy of the class to my solution and simply remove this restriction it works fine.

Is there a reason this restriction is added?

Start at SmartEnumNameConverter and trace why TValue is constrained to IConvertible; compare its Guid serialization path with existing supported values. Done means the converter supports name serialization for Guid-backed SmartEnums while preserving current behavior for other underlying values, with regression coverage.

Written by the indexing model from the issue text.