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Nullable input type

See original GitHub issue

First of all great work with this! Really like the developer experience using this generator. However, I encountered an issue (it might be me missing something rather than an issue 😄)

Have the following input type defined:

public record ModifyUnitAdministatorInput(
        int Id,
        Optional<string?> Cvr,
        Optional<string?> CompanyName,
        );

and mutation signature:

public async Task<ModifyUnitAdministratorPayload> ModifyUnitAdministator(
            ModifyUnitAdministatorInput input, [Service] ApplicationDbContext dbContext) {...}

Generating the client:

var schema = await GraphQlGenerator.RetrieveSchema(url);
var csharpCode = new GraphQlGenerator().GenerateFullClientCSharpFile(schema, clientName);

Then I get some strange queries when building with nullable values:

string? value = null;
var unitAdminInput = new ModifyUnitAdministatorInput{ Cvr = value };
var mutationBuilder = new MutationQueryBuilder()
                .WithModifyUnitAdministator(
                    new ModifyUnitAdministratorPayloadQueryBuilder()
                        .WithUnitAdministrator(
                            new UnitAdministratorQueryBuilder()
                                .WithCvr()
                            )
                        , unitAdminInput);

"mutation{
    modifyUnitAdministator(input:{
        cvr:\"GraphQLApiClient.QueryBuilderParameter`1[System.String]\"
   })
   {
     unitAdministrator { cvr }
   }
}"

Am I doing something wrong?