Array Representation in Generated Documentation

I'm having some issues with generated documentation when it comes to array representation. Here is my struct code:
```
type ThingsPage struct {
Things []Thing `json:"things" doc:"A list of things."`
}
```

The generated yaml looks like
```
ThingsPage:
additionalProperties: true
properties:
things:
description: A list of things.
items:
$ref: "#/components/schemas/Thing"
type:
- array
- "null"
required:
- things
type: object
```

The `"null"` under the type removes the ability for the visualized documentation to expand the properties of `Thing`. I tried a couple things, like adding nullable:"false" and required:"true" struct tags, but nothing seems to remove that `"null"` from the generated yaml. The desired yaml should look like
```
ThingsPage:
additionalProperties: true
properties:
things:
description: A list of things.
items:
$ref: "#/components/schemas/Thing"
type: array
required:
- things
type: object
```

Any help would be appreciated.