Three views called map.setProjection(projection.value) with the bare name ('globe'|'mercator'),
unguarded, including inside style.load handlers. Mapbox takes the name; MapLibre 5 takes a
specification object ({ type }), so under provider=maplibre the toggle did nothing or threw
mid-restyle. setProjectionFor(map, name) passes the engine's shape and is guarded; all six call
sites use it. Found by the engine-asymmetric API sweep (universal-props matrix, new column).
Headless: a fake-map unit test (MapLibre gets {type}, Mapbox the string, a throw is swallowed,
null/empty no-op) 5/5; BUNDLE=pplr-data-maps builds. Plugin-local: pplrData.js has no other consumer.
needs eyes: PPLR Religion view with ?provider=maplibre: the 🌐/🗺 button switches globe and mercator.
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