InvalidCastException when filtering on nullable value types

[marcasburnett]

I have a type with nullable DateTime properties, which in some cases I need to add to my FilterCondition. When I do that, I get the error below. It looks like this is because NullableValueTypeDdbConverter inherits from DdbConverter but changes the nullability of the type parameter, which for value types means a totally different type.

Unable to cast object of type 'EfficientDynamoDb.Internal.Converters.NullableValueTypeDdbConverter1[System.DateTime]' to type 'EfficientDynamoDb.Converters.DdbConverter1[System.DateTime]'.
at EfficientDynamoDb.FluentCondition.Core.FilterBase1.GetPropertyConverter[TProperty](DdbExpressionVisitor visitor, Boolean useSize) at EfficientDynamoDb.FluentCondition.Operators.Common.FilterLessThan2.WriteAttributeValues(DdbWriter& writer, DynamoDbContextMetadata metadata, Int32& valuesCount, DdbExpressionVisitor visitor)
at EfficientDynamoDb.FluentCondition.Core.FilterOrWrapper.WriteAttributeValues(DdbWriter& writer, DynamoDbContextMetadata metadata, Int32& valuesCount, DdbExpressionVisitor visitor)
at EfficientDynamoDb.FluentCondition.Core.FilterOrWrapper.WriteAttributeValues(DdbWriter& writer, DynamoDbContextMetadata metadata, Int32& valuesCount, DdbExpressionVisitor visitor)
at EfficientDynamoDb.FluentCondition.Core.FilterAndWrapper.WriteAttributeValues(DdbWriter& writer, DynamoDbContextMetadata metadata, Int32& valuesCount, DdbExpressionVisitor visitor)
at EfficientDynamoDb.Internal.Extensions.Utf8JsonWriterExtensions.WriteConditionExpression(DdbWriter& writer, NoAllocStringBuilder& builder, DdbExpressionVisitor visitor, FilterBase condition, DynamoDbContextMetadata metadata)
at EfficientDynamoDb.Internal.Extensions.Utf8JsonWriterExtensions.WriteConditionExpression(DdbWriter& writer, FilterBase condition, DynamoDbContextMetadata metadata)
at EfficientDynamoDb.Internal.Operations.PutItem.PutItemHighLevelHttpContent.WriteDataAsync(DdbWriter ddbWriter)
at EfficientDynamoDb.Internal.Operations.Shared.DynamoDbHttpContent.SerializeToStreamAsync(Stream stream, TransportContext context)
at EfficientDynamoDb.Internal.Operations.Shared.DynamoDbHttpContent.SerializeToStreamAsync(Stream stream, TransportContext context)
at EfficientDynamoDb.Internal.Operations.Shared.DynamoDbHttpContent.CreatePooledContentReadStreamAsync()
at EfficientDynamoDb.Internal.HttpApi.SendAsync(DynamoDbContextConfig config, HttpContent httpContent, CancellationToken cancellationToken)
at EfficientDynamoDb.DynamoDbContext.PutItemAsync[TEntity](BuilderNode node, CancellationToken cancellationToken)