Namespace Datastore throws when queried.

[saul-jb]

The Namespace Datastore will throw an error if query is called when the parent datastore has other values in it that aren't prefixed the same.

The following code will produce this issue.

import { NamespaceDatastore, MemoryDatastore } from 'datastore-core'
import { Key } from 'interface-datastore'

const root = new MemoryDatastore();
const sub1 = new NamespaceDatastore(root, new Key('sub1'))
const sub2 = new NamespaceDatastore(root, new Key('sub2'))

sub1.put(new Key('test'), new Uint8Array([123]))

for await (const pair of sub2.query({})) { }

Creating the following error:

          throw new Error(`Expected prefix: (${prefix.toString()}) in key: ${key.toString()}`)
                ^
Error: Expected prefix: (/sub2) in key: /sub1/test

The expected behavior is for the query to only run on namespaced keys.

Versions:

"datastore-core": "^9.2.0"
"interface-datastore": "^8.2.3"

[welcome]

Thank you for submitting your first issue to this repository! A maintainer will be here shortly to triage and review.
In the meantime, please double-check that you have provided all the necessary information to make this process easy! Any information that can help save additional round trips is useful! We currently aim to give initial feedback within two business days. If this does not happen, feel free to leave a comment.
Please keep an eye on how this issue will be labeled, as labels give an overview of priorities, assignments and additional actions requested by the maintainers:

• "Priority" labels will show how urgent this is for the team.
• "Status" labels will show if this is ready to be worked on, blocked, or in progress.
• "Need" labels will indicate if additional input or analysis is required.

Finally, remember to use https://discuss.ipfs.io if you just need general support.