This was a response to a very specific use case, and is completely unnecessary in any other situation. Tealium's standard async CoreMetrics tag works just fine, and there's no need to put anything in utag.sync.js. You won't be losing any tracking as long as you follow our best practice and load utag.js at the top of the , or as close to the top as you can get it.
I hope this clarifies things.
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