Per-tick locale memoization, error isolation in dateObserver, sync connectedCallback - #369

Per-tick locale memoization, error isolation in dateObserver, sync connectedCallback#369

mattcosta7 with Copilot wants to merge 2 commits into

copilot/optimize-relative-time-updategithub/relative-time-element:copilot/optimize-relative-time-updatefrom

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