Defer execution of observer callbacks #278
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This PR fixes #277 by deferring execution of all Performance Observer callbacks by a microtask, which will allow the current call stack to complete and ensure all module-scoped variables are available within the callback itself. This is needed to address an interop issue with Safari.
This PR also removes some related logic that was only needed to address compat issues in older versions of Safari. Since this logic is not needed in the last two major versions of Safari, it's safe to remove from this library.