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Why does the different lines give different return values?
val tagIds = postData._1 map (TagTable.newTag(_))
// tagIds is defined as val tagIds: Array[Long]
and
val tagIds = for(tag <- postData._1) yield TagTable.newTag(_)
// tagIds is defined as val tagIds: Array[models.UnsavedTag => Long]
Due to a simple typing error: