Weird format of PartialFailureError.Details[0]. Shouldn't it be JSON instead of a string

[Ray]

I have written this code to force a PartialFailureError to try and parse 
the PartialFailureError to handle my errors correctly but I'm having 
trouble actually parsing the error. Here is the code below

            var invalidAsset = new Asset
            {
                Name = "My Test Asset",
                Type = AssetType.Image,
                TextAsset = new TextAsset
                {
                    Text = new string('B', 500000)
                }
            };

            var invalidAsset2 = new Asset
            {
                Name = "Invalid Video Asset",
                Type = AssetType.YoutubeVideo,
                YoutubeVideoAsset = new YoutubeVideoAsset
                {
                    YoutubeVideoId = "invalid_video_id"
                }
            };

            var invalidAsset3 = new Asset
            {
                Name = "My Test Asset",
                Type = AssetType.Image,
                TextAsset = new TextAsset
                {
                    Text = new string('B', 500000)
                }
            };


            var validAsset = new Asset
            {
                Name = "My Test Asset",
                Type = AssetType.Text,
                TextAsset = new TextAsset
                {
                    Text = "This is a valid asset."
                }
            };

            var operations = new AssetOperation[]
            {
                    new AssetOperation { Create = validAsset },
                    new AssetOperation { Create = invalidAsset },
                    new AssetOperation { Create = invalidAsset2 },
                    new AssetOperation { Create = invalidAsset3 }
            };
            GAS.MutateAssetsResponse response;

            var request = new MutateAssetsRequest
            {
                CustomerId = CustomerId.ToString(),
                PartialFailure = true,
                Operations = { operations }
            };

            try
            {
                response = service.MutateAssets(request);
                testOutputHelper.WriteLine("Asset Resource Name: " + 
response.Results[0].ResourceName);
            }
            catch (GoogleAdsException ex)
            {
                testOutputHelper.WriteLine($"Error: {ex.Message}");
                testOutputHelper.WriteLine($"Failure: {ex.Failure}");
            }

and what I get back for the response back for 
response.PartialFailureError.Details[0] is

[0] { "@type": 
"type.googleapis.com/google.ads.googleads.v17.errors.GoogleAdsFailure", 
"@value": 
"CurCHgoDsAMDEglUb28gbG9uZy4apMIeKqDCHkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk…
 

Shouldn't value be some valid json instead of this string? I tried base64 
decoding it and I got "Too long.  * BBBBBBBBB..." which only corresponds to 
the first error that I got and instead of all the errors as I had multiple 
invalid assets. So my question is what format is this value string exactly 
in so I can decode it and parse the errors from there and also should there 
be more than one error coming back? I know there should be more than one 
error when decoding because this is the PartialFailureError.Message that I 
get back "Multiple errors in ‘details’. First error: Too long., at 
operations[1].create.text_asset.text". 

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