trwnh.com/wiki.hugo/content/tech/spec/activitypub/Collection.md

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A Collection is an Object that has `items` or `orderedItems`
however, `orderedItems` is valid on both Collection and OrderedCollection! it is defined like this in the as2 context:
```json
"orderedItems": {
"@id": "as:items",
"@type": "@id",
"@container": "@list"
}
```
so it is basically just an alias for `items` where it MUST be an array, and the array's order matters. (if it were `@container: set`, then it MUST be an array, but the array's order does not matter.)
### tangent: a Collection may be ordered without being an OrderedCollection
OrderedCollection is defined as strictly reverse chronological by ActivityPub. however, other orderings are valid on regular Collections. the use of the `orderedItems` term allows plain-JSON implementations to do exactly this.