The choropleth's bin edges were a 5-stop literal (5/20/60/150/Infinity) in
DashboardMapPanel.vue. Those numbers are not a property of choropleths; they
are a property of THIS dataset — ~2000 people groups in focus. Pointed at a
200-group dataset, a 150 cutoff puts every country in the bottom bin and the
map renders uniformly pale: no crash, no error, correct code, meaningless map.
A dataset assumption wearing the costume of a constant.
The top band is the HEARTBEAT ZONE — the countries holding the most people
groups. Its edge now comes from dashboard.config.js as map.heartbeatThreshold,
alongside the other per-dataset facts (facets, columns, kpis). Re-pointing the
dashboard at a new dataset is a config edit, not a source edit.
Splits the old fused BINS array into the two independent facts it always was:
BIN_COLORS (measured against the navy pin, dataset-independent) and the edges
(pure dataset assumption). Fused, moving a threshold meant restating every hex
— silently reverting the contrast work — and restyling meant restating every
edge. Set either alone now.
Setting heartbeatThreshold alone rescales the three lower edges by their
original ratios, so the ramp keeps its shape (long tail of small counts, short
head of large ones) at any dataset size. Legend labels derive from the edges,
so a moved threshold cannot leave a stale "150+" on the legend. Opt-in
'quantile' mode derives the edges from the data actually loaded; it is NOT the
default, because 150 is a deliberate number for this dataset and a derived
default would silently change today's map.
Two bugs found and fixed while measuring:
- Edges could land at 1, creating a bin no count can enter (colorFor tests
`count < upTo`): the ramp painted 4 of its 5 colours while the legend
advertised 5. Appeared at threshold 40 and again in quantile mode.
- profileConfig merged shallowly, so a host passing the single key it cares
about — {map:{heartbeatThreshold:40}} — replaced the whole map object and
dropped mapStyle:'paper'. The one override a host is most likely to write
was the one that broke the basemap. `map` now merges one level deep; every
other key stays shallow.
No defineProps: the registered custom element is ProfileLoader, which renders
the profile with no props bound, so a prop declared on the profile would read
as configurable and never fire. The reachable attribute path is ProfileLoader's
existing profile-config JSON, verified end-to-end.
Default rendering is unchanged, verified by measurement rather than eyeball:
bin assignment over the 114-row committed fixture (59 countries) plus a 17-point
count sweep is identical before and after, with and without config supplied.
internal/check-heartbeat-threshold.mjs executes the resolver from the live SFC
and asserts the bins MOVE when the config moves — a grep for "150" would both
false-positive (it is the legitimate default) and false-negative (a
re-hard-coding at 200 sails through). Its --self-test re-hard-codes the ramp in
memory and requires the gate to reject it.
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