Fix tags again, tweak feeds and stores

packages/util/Repository.ts

@@ -1,5 +1,5 @@
 import {throttle} from 'throttle-debounce'
-import type {Readable, Subscriber, Invalidator} from '@welshman/lib'
+import type {IReadable, Subscriber, Invalidator} from '@welshman/lib'
 import {Derived, Emitter, writable, first, always, chunk, sleep, uniq, omit, now, range, identity} from '@welshman/lib'
 import {Kind} from './Kinds'
 import {matchFilter, getIdFilters, matchFilters} from './Filters'
@@ -16,7 +16,7 @@ export type RepositoryOptions = {
   throttle?: number
 }
 
-export class Repository<E extends Rumor> extends Emitter implements Readable<Repository<E>> {
+export class Repository<E extends Rumor> extends Emitter implements IReadable<Repository<E>> {
   eventsById = new Map<string, E>()
   eventsByAddress = new Map<string, E>()
   eventsByTag = new Map<string, E[]>()

packages/util/Tags.ts

@@ -108,7 +108,7 @@ export class Tags extends (Fluent<Tag> as OmitStatics<typeof Fluent<Tag>, 'from'
 
     // Add different types separately so positional logic works
     dispatchTags(tags.whereKey("e"))
-    dispatchTags(tags.whereKey("a"))
+    dispatchTags(tags.whereKey("a").filter(t => Boolean(t.nth(3))))
     mentionTags.forEach((t: Tag) => mentions.push(t.valueOf()))
 
     return {