diff --git a/lib/core/util.js b/lib/core/util.js
index 5a28529b663..f7855c7256c 100644
--- a/lib/core/util.js
+++ b/lib/core/util.js
@@ -334,19 +334,11 @@ function isDisturbed (body) {
 }
 
 function isErrored (body) {
-  return !!(body && (
-    stream.isErrored
-      ? stream.isErrored(body)
-      : /state: 'errored'/.test(nodeUtil.inspect(body)
-      )))
+  return !!(body && stream.isErrored(body))
 }
 
 function isReadable (body) {
-  return !!(body && (
-    stream.isReadable
-      ? stream.isReadable(body)
-      : /state: 'readable'/.test(nodeUtil.inspect(body)
-      )))
+  return !!(body && stream.isReadable(body))
 }
 
 function getSocketInfo (socket) {
@@ -417,10 +409,7 @@ function throwIfAborted (signal) {
     signal.throwIfAborted()
   } else {
     if (signal.aborted) {
-      // DOMException not available < v17.0.0
-      const err = new Error('The operation was aborted')
-      err.name = 'AbortError'
-      throw err
+      throw new DOMException('The operation was aborted', 'AbortError')
     }
   }
 }