.

wcfs/internal/xbtree/δbtail.go

@@ -771,17 +771,14 @@ func (δBtail *ΔBtail) GetAt(ctx context.Context, root *Tree, key Key, at zodb.
 
 	// XXX handle deletion
 
-	// FIXME stub -> that only ZBlk.rev is used
-	//return @head, rev=.Tail(), revExact=false
-
 	// XXX dirty -> rebuild
 
-	// XXX -> index lastXXXOf(key) | linear scan ↓ looking for change <= at
 	δTtail := δBtail.vδTbyRoot[root.POid()]
 	if δTtail == nil {
 		panicf("δBtail: root<%s> not tracked", root.POid())
 	}
 
+	// XXX -> index lastXXXOf(key) | linear scan ↓ looking for change <= at
 	for i := len(δTtail.vδT)-1; i >= 0; i-- {
 		δT := δTtail.vδT[i]
 		if at < δT.Rev {

wcfs/internal/zdata/δftail.go

@@ -464,8 +464,6 @@ func (δFtail *ΔFtail) SliceByFileRev(zfile *ZBigFile, lo, hi zodb.Tid) /*reado
 func (δFtail *ΔFtail) LastBlkRev(ctx context.Context, zf *ZBigFile, blk int64, at zodb.Tid) (_ zodb.Tid, exact bool) {
 	//defer xerr.Contextf(&err, "")	// XXX text
 
-	// XXX assert δFtail == f.head.bfdir.δFtail ?
-
 	// XXX tabRev -> treeRev ?
 	// XXX activate zfile?
 	zblkOid, ok, tabRev, tabRevExact, err := δFtail.δBtail.GetAt(ctx, zf.blktab, blk, at)
@@ -481,8 +479,6 @@ func (δFtail *ΔFtail) LastBlkRev(ctx context.Context, zf *ZBigFile, blk int64,
 
 	// blktab[blk] was changed to point to a zblk @rev.
 	// blk revision is max rev and when zblk changed last in (rev, at] range.
-	//
-	// XXX need to use full δZ, not only connected to tracked subset?
 	zblkRev, zblkRevExact := δFtail.δBtail.ΔZtail().LastRevOf(zblkOid, at)
 	if zblkRev > tabRev {
 		return zblkRev, zblkRevExact

wcfs/internal/zdata/δftail_test.go

@@ -289,6 +289,7 @@ func testΔFtail(t_ *testing.T, testq chan ΔFTestEntry) {
 		for blk := range δblk {
 			blkRev[blk] = commit.At
 		}
+		blkRevAt[commit.At] = blkRev
 
 		var δfok *ΔFile
 		if len(δblk) != 0 {