pnorman left a comment (openstreetmap/openstreetmap-website#6618)
> What I’d like to get out of this conversation is whether the current main map
> (or the dashboard map prior to
> [#6504](https://github.com/openstreetmap/openstreetmap-website/pull/6504))
> steers clear of the concern you’ve raised. If so, then “don’t do it” suggests
> that we could disable incremental zooming whenever a map shows the Standard
> layer and reenable incremental zooming whenever it shows the Shortbread or
> MapTiler OMT layer.
Right now it's don't do it. Any scale other than a tile size of 256 DI pixels
will result in the text and symbols appearing too large or too small. Too small
is particularly undesirable for OpenStreetMap Carto because it uses fonts on
the smaller side. This does **not** cause blurriness. That is caused by
displaying tiles as something other than 256 physical pixels, and this
blurriness is normal on most devices. It's a limitation of the standard layer
and its rendering stack more than OpenStreetMap Carto itself.
When switching from a layer that supports fractional zooms to one that doesn't
I would go with rounding to the scale of the closest integer zoom. This results
in the least change of scale or area displayed.
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