stream: fix highWaterMark integer overflow

lib/_stream_readable.js

@@ -72,7 +72,7 @@ function ReadableState(options, stream) {
   this.highWaterMark = (hwm || hwm === 0) ? hwm : defaultHwm;
 
   // cast to ints.
-  this.highWaterMark = ~~this.highWaterMark;
+  this.highWaterMark = Math.trunc(this.highWaterMark);
 
   // A linked list is used to store data chunks instead of an array because the
   // linked list can remove elements from the beginning faster than

lib/_stream_writable.js

@@ -55,7 +55,7 @@ function WritableState(options, stream) {
   this.highWaterMark = (hwm || hwm === 0) ? hwm : defaultHwm;
 
   // cast to ints.
-  this.highWaterMark = ~~this.highWaterMark;
+  this.highWaterMark = Math.trunc(this.highWaterMark);
 
   // drain event flag.
   this.needDrain = false;

test/parallel/test-streams-highwatermark.js

@@ -0,0 +1,11 @@
+'use strict';
+
+require('../common');
+const assert = require('assert');
+const stream = require('stream');
+
+const readable = stream.Readable({ highWaterMark: 2147483648 });
+assert.strictEqual(readable._readableState.highWaterMark, 2147483648);
+
+const writable = stream.Writable({ highWaterMark: 2147483648 });
+assert.strictEqual(writable._writableState.highWaterMark, 2147483648);