GetRequestablePieces: remove runtime correctness check (#902)

request-strategy/order.go

@@ -3,7 +3,6 @@ package requestStrategy
 import (
 	"bytes"
 
-	g "github.com/anacrolix/generics"
 	"github.com/anacrolix/multiless"
 
 	"github.com/anacrolix/torrent/metainfo"
@@ -52,16 +51,7 @@ func GetRequestablePieces(
 		storageLeft = &cap
 	}
 	var allTorrentsUnverifiedBytes int64
-	var lastItem g.Option[pieceRequestOrderItem]
 	pro.tree.Scan(func(_i pieceRequestOrderItem) bool {
-		// Check that scan emits pieces in priority order.
-		if lastItem.Ok {
-			if _i.Less(&lastItem.Value) {
-				panic("scan not in order")
-			}
-		}
-		lastItem.Set(_i)
-
 		ih := _i.key.InfoHash
 		var t Torrent = input.Torrent(ih)
 		var piece Piece = t.Piece(_i.key.Index)