### Before submitting

This repo is for Npgsql ADO.NET issues only. Entity Framework issues belong in Npgsql.EntityFrameworkCore.PostgreSQL for EF Core, or EntityFramework6.Npgsql for EF 6.x.

### Steps to reproduce

Ideally include a complete code listing that we can run to reproduce the issue.
Alternatively, you can provide a project/solution that we can run.

### The issue
Describe what is not working as expected.

If you are seeing an exception, include the full exceptions details (message and stack trace).

```
Exception message:
Stack trace:
```

### Further technical details

Npgsql version:
PostgreSQL version:
Operating system: 

Other details about my project setup:

