The inactivity cutoff timer cannot fire while the computer is asleep, and
performance.now() keeps running through sleep on some platforms, so after
a wake the whole slept span could be credited as reading time (inflating
min/visit stats). A gap longer than the inactivity timeout now closes the
span at its intended cutoff, and the cutoff timer clamps its accumulation
to its scheduled fire time — covering both event-first and timer-first
wake orderings.
LeoVasanko
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