[Bugfix] Do not allow the user method to change its return types over its lifecycle #567
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I discovered a bug in the recently added "user" method for analytics buffered. It's the only method that's both synchronous and non-chained, so the bug didn't reveal itself previously.
Do not allow the "user" method to change its return types over its lifecycle. We should always return a promise for wrapped methods in AnalyticsBrowser, regardless if the underlying Analytics method is sync or async.