Note that changing it to do the impl split on the top-level would be a non-breaking change for users/integrators (as long as they use no internal types of course). It's a different story with spi of course.

But actually I'm starting to like the idea of doing the split between a) things intended to be used by others (API/SPI) and b) internal parts on the top-level, while doing the split between API and SPI within each public package. This allow for a clear public/private split while leaving related things in the public-facing parts close by (and the change would be non-breaking).

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