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http://dev.w3.org/2006/webapi/FileAPI/#methodsandparams-blob The "normalize parameters" is only used by slice(). As such, I think it doesn't make much sense to split it out from the slice() algorithm. Moreover, the "When processing the slice call, user agents must normalize start to relativeStart." means it gets stuck in an infinite loop if read literally. I would prefer if the steps that do something were moved into the slice() algorithm and the surrounding prose was removed.
Agreed; this change is long overdue, so thanks for catching it in a bug. Done.