no need for special casing it

lib/view.js

@@ -1,8 +1,6 @@
 const { Readable, getStreamError } = require('streamx')
 const b4a = require('b4a')
 
-const DROPPED = [null, null, null]
-
 class OverlayStream extends Readable {
   constructor (stream, start, end, reverse, changes, ranges) {
     super()
@@ -141,10 +139,6 @@ class Overlay {
     changes.sort(cmp)
     ranges.sort(cmp)
 
-    while (changes.length > 0 && changes[changes.length - 1] === DROPPED) {
-      changes.pop()
-    }
-
     this.indexed = view.indexed
     this.changes = changes
     this.ranges = ranges
@@ -268,8 +262,8 @@ class View {
     const s = b4a.toString(range[0], 'hex')
     const e = b4a.toString(range[2], 'hex')
 
-    for (const key of this.map.keys()) {
-      if (s <= key && key < e) this.map.set(key, DROPPED)
+    for (const [key, c] of this.map) {
+      if (s <= key && key < e) this.map.set(key, [c[0], null, null])
     }
 
     if (this.ranges === null) this.ranges = []
@@ -315,9 +309,6 @@ class View {
 module.exports = View
 
 function cmpChange (a, b) {
-  if (a === DROPPED) return b === DROPPED ? 0 : 1
-  if (b === DROPPED) return a === DROPPED ? 0 : -1
-
   const c = b4a.compare(a[0], b[0])
   return c === 0 ? b4a.compare(a[2], b[2]) : c
 }