When using sqlc-gen-csharp with a Postgres enum that is declared as non-nullable in the schema, the generated C# code does not compile.
Specifically, the generated class references .Value.Stringify() on the enum property, which is invalid when the enum type is not nullable.

Generated cs:

public class CreateBoogerSampleArgs
{
    public required int Id { get; init; }
    public required Booger BoogerType { get; init; }
};

public async Task CreateBoogerSample(CreateBoogerSampleArgs args)
{
    var queryParams = new Dictionary<string, object?>();
    queryParams.Add("id", args.Id);
    queryParams.Add("booger_type", args.BoogerType.Value.Stringify());
    ...
}

query.sql:

-- name: CreateBoogerSample :exec
INSERT INTO booger_sample (id, type)
VALUES (@id, @booger_type);

schema.sql:

CREATE TYPE booger AS ENUM (
    'fresh',
    'old'
);

CREATE TABLE booger_sample (
    id INT NOT NULL,
    type booger NOT NULL
);

Expected Behavior
For a non-nullable enum column, the generated code should not reference .Value. Instead, it should call .Stringify() directly on the enum property.
Correct code should look like:

queryParams.Add("booger_type", args.BoogerType.Stringify());

Environment
sqlc docker image: latest
Database: PostgreSQL
Target: C# (Dapper + Npgsql)
sqlc-gen-csharp: v0.21.2

• 98990c2a46b0e315c7f062f5643e3404ed4150a5ef2808c47a4e10084443506e