Merge fb5c316 into fb0f3a0

__tests__/patch.js

@@ -648,6 +648,21 @@ describe("arrays - splice (shrink)", () => {
 	)
 })
 
+describe.only("arrays - delete", () => {
+	runPatchTest(
+		{
+			x: [
+				{a: 1, b: 2},
+				{c: 3, d: 4}
+			]
+		},
+		d => {
+			delete d.x[1].c
+		},
+		[{op: "remove", path: ["x", 1, "c"]}]
+	)
+})
+
 describe("sets - add - 1", () => {
 	runPatchTest(
 		new Set([1]),

src/es5.ts

@@ -241,15 +241,22 @@ function markChangesRecursively(object: any) {
 				markChangedES5(state)
 			}
 		})
-	} else if (type === ProxyType.ES5Array && hasArrayChanges(state)) {
-		markChangedES5(state)
-		assigned.length = true
+	} else if (type === ProxyType.ES5Array) {
+		if (hasArrayChanges(state)) {
+			markChangedES5(state)
+			assigned.length = true
+		}
+
 		if (draft.length < base.length) {
 			for (let i = draft.length; i < base.length; i++) assigned[i] = false
 		} else {
 			for (let i = base.length; i < draft.length; i++) assigned[i] = true
 		}
-		for (let i = 0; i < draft.length; i++) {
+
+		// Minimum count is enough, the other parts has been processed.
+		const min = Math.min(draft.length, base.length)
+
+		for (let i = 0; i < min; i++) {
 			// Only untouched indices trigger recursion.
 			if (assigned[i] === undefined) markChangesRecursively(draft[i])
 		}