activefiresmyloc (bounding box, published fields, out-of-range coordinates),
activefiresunionmyloc (geoIntersects, including a shape larger than the viewport)
and mysubscriptions (own subscriptions only, nothing for anonymous visitors).
Runs the real worker against the real @turf modules, because what broke twice was
never the geometry: the worker script and the turf packages sit in sibling
directories of the bundle that a bare require() cannot reach (3249362), and the
first fix doubled the programs/server prefix so nothing resolved (570cb49).
The last test is the reason the worker exists at all: timers keep firing while a
120-circle union computes. Revert fbb746f and it fails.
The cases are the incidents: a worker failure must leave the stored union alone
instead of overwriting it with "null" (50ca9cc), an incremental merge must refuse
to run on state that is not exactly one behind, recomputes must coalesce while
adds must not be dropped, and legacy telegram subscriptions (no radius, no
location) must be skipped without throwing.
Also the 16 MiB case the FIXME asked for: a 20 MB union comes back under the cap,
still parseable, with the degradation recorded.
