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Fix 4326 streaks in regions reaching a pole on Mercator - #106
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Fixes streaks on Mercator across every EPSG:4326 region that reaches a pole (CMIP6 tasmax, Icechunk IMERG), from #102.
Regions reaching 90° have meshes far past the Mercator world, so the latitude lookup was anchored off-map, where its Float32 terms cancel. The lookup now anchors to the visible part of the region, with a new
u_latShiftuniform. Regions inside the world are unchanged.#100 followup fix