Why does my image looked stretched when using Resizer v2?

Why does setting the width and height of an image in Resizer v2 stretch my image?

When setting the width and height of an image in resizer v2, you can remove the stretching by setting the smart crop to "true" as a query parameter (&smart=true).  Your image URL would look something like this:

Resizer v1 to v2 redirects