@ahrens 
> It would be nice if zfeature_register() could verify that if 
> ZFEATURE_FLAG_PER_DATASET is set, then the feature depends on 
> SPA_FEATURE_EXTENSIBLE_DATASET

Is the converse supposed to be true?
I noticed bookmarks and filesystem_limits have SPA_FEATURE_EXTENSIBLE_DATASET 
but are ZFEATURE_FLAG_READONLY_COMPAT, not ZFEATURE_FLAG_PER_DATASET or 
(ZFEATURE_FLAG_READONLY_COMPAT | ZFEATURE_FLAG_PER_DATASET).

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