world.respect.lib.opds.model.ext.OpdsFeedItemIndex -> dv4:
# {"id":"sourceFile","fileName":"OpdsFeedItemIndex.kt"}
    int groupIndex -> a
    int index -> b
    1:3:void <init>(int,int):13:13 -> <init>
    4:5:void <init>(int,int):14:14 -> <init>
    6:8:void <init>(int,int):15:15 -> <init>
    5:27:boolean equals(java.lang.Object):0:0 -> equals
    1:16:int hashCode():0:0 -> hashCode
    1:32:java.lang.String toString():0:0 -> toString
