Can app-indexeddb-mirror receive liveData from several sources?

[sruditsky]

Description

A question about the relationship between the app-indexeddb-mirror element and its source element(s).

This is from the app-indexeddb-mirror doc page:

<firebase-query
    app-name="cats-app"
    path="/cats"
    order-by-child="name"
    data="{{liveData}}">
</firebase-query>
<app-indexeddb-mirror
    key="cats"
    data="{{liveData}}"
    persisted-data="{{persistedData}}">
</app-indexeddb-mirror>

But what if I want several sources (of identically structured items) to end up in a single app-indexeddb-mirror. I.e. something like:

<template is="dom-repeat" items="[[names]]">
   <firebase-query
       app-name="cats-app"
       path="/cats"
       order-by-child="name"
       equal-to="[[item.name]]"
       data="{{liveData}}">
</template>
<app-indexeddb-mirror
    key="cats"
    data="{{liveData}}"
    persisted-data="{{persistedData}}">
</app-indexeddb-mirror>

I tried this and it does work, but only sometimes. It seems to break when names changes. So two questions: 1 Is this a valid use case for use of app-indexeddb-mirror? 2 If not, any recommendation of how something like this should be implemented?