nodejs
diff --git a/‎lib/internal/blob.js‎
Lines changed: 7 additions & 0 deletions b/‎lib/internal/blob.js‎
Lines changed: 7 additions & 0 deletions
diff --git a/‎test/parallel/test-blob.js‎
Lines changed: 1 addition & 0 deletions b/‎test/parallel/test-blob.js‎
Lines changed: 1 addition & 0 deletions
@@ -54,6 +54,7 @@ const {
   lazyDOMException,
 } = require('internal/util');
 const { inspect } = require('internal/util/inspect');
+const { convertToInt } = require('internal/webidl');
 
 const {
   codes: {
@@ -239,6 +240,12 @@ class Blob {
   slice(start = 0, end = this[kLength], contentType = '') {
     if (!isBlob(this))
       throw new ERR_INVALID_THIS('Blob');
+
+    // Coerce values to int
+    const opts = { __proto__: null, signed: true };
+    start = convertToInt('start', start, 64, opts);
+    end = convertToInt('end', end, 64, opts);
+
     if (start < 0) {
       start = MathMax(this[kLength] + start, 0);
     } else {
 
@@ -483,6 +483,7 @@ assert.throws(() => new Blob({}), {
 
   assert.ok(blob.slice(0, 1).constructor === Blob);
   assert.ok(blob.slice(0, 1) instanceof Blob);
+  assert.ok(blob.slice(0, 1.5) instanceof Blob);
 }
 
 (async () => {
Original file line number	Diff line number	Diff line change
@@ -483,6 +483,7 @@ assert.throws(() => new Blob({}), {
483	483
484	484	assert.ok(blob.slice(0, 1).constructor === Blob);
485	485	assert.ok(blob.slice(0, 1) instanceof Blob);
	486	+ assert.ok(blob.slice(0, 1.5) instanceof Blob);
486	487	}
487	488
488	489	(async () => {