fix(core): fix the instance cache logic, closes #2666 #2667
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It turns out that in lazy-loads and other sufficiently complex use-cases (e.g, not my sample app) ngc / webpack has now (6.1) decided that our injectables (such as AngularFirestore) can be duplicated.
While I was aware this could happen (lazy-loads for instance) and intended my instance cache to cover this and the HMR use-case, I had a bug in my fetch logic which would try to reinitialize the SDK instance even when the settings hadn't changed. Whoops. Explains why this wasn't working for HMR users as intended either.