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If I remember correctly, the problem was that it resulted in lots of false positives when Magnolia-derived implicits were considered for types which were later satisfied by different implicits.
Unfortunately, it's not clear to the Magnolia macro that there won't be some other implicit in scope which the compiler tries later, that will conform to the required type. It was a long time ago I did this, though...
I see, thanks for the insights! I recently added an @implicitNotFound annotation to guide users on how to deal with this, hopefully it’ll help. Again thanks for your work on this and I’m glad I’ll get to meet you at Functional Scala!
Cool, I'll see you there—make sure you find me at some moment and introduce yourself!
I must add that apparently, some thousands-lines-ugly-compiler errors that happened with 0.12.0 seem no longer happening with 0.12.2. This is based on a single use case but it's looking good. Big 
@Joro_Kr !
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