1ec5 left a comment (openstreetmap/openstreetmap-website#6234)
In OpenHistoricalMap, we kept the current “raster zoom levels” in the URL hash,
translating them to “vector zoom levels” on the fly. So `#map=17/…` continues
to show the same scale as before by requesting z16 tiles and styling them based
on an internal zoom level of 16. This avoids breaking existing links and
permalinks, which is important to most users.
It’s constantly annoying to have to keep specifying which scale you mean, but
at least most users don’t have to think about the difference. They usually have
to learn about the vector zoom levels once they make their own map or need to
debug the tiles in a tile inspector. This awkwardness may become more prominent
when we start integrating Spyglass in earnest.
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