diff --git a/browser/bundle.js b/browser/bundle.js
index 89582b70d..22c566e40 100644
--- a/browser/bundle.js
+++ b/browser/bundle.js
@@ -3819,7 +3819,7 @@ var captureStackTrace = (function stackDetection() {
         typeof "".startsWith === "function" &&
         (err.stack.startsWith("stackDetection@")) &&
         stackDetection.name === "stackDetection") {
-
+        
         defineProperty(Error, "stackTraceLimit", {
             writable: true,
             enumerable: false,
@@ -4124,7 +4124,7 @@ function ensureNotHandled(reason) {
 
 function markAsOriginatingFromRejection(e) {
     try {
-        notEnumerableProp(e, "__rejectionError__", RejectionError);
+        notEnumerableProp(e, "isAsync", true);
     }
     catch(ignore) {}
 }
@@ -4132,7 +4132,7 @@ function markAsOriginatingFromRejection(e) {
 function originatesFromRejection(e) {
     if (e == null) return false;
     return ((e instanceof RejectionError) ||
-        e["__rejectionError__"] === RejectionError);
+        e["isAsync"] === true);
 }
 
 function attachDefaultState(obj) {
@@ -4162,6 +4162,7 @@ function canAttach(obj) {
 
 function subError(nameProperty, defaultMessage) {
     function SubError(message) {
+        if (!(this instanceof SubError)) return new SubError(message);
         this.message = typeof message === "string" ? message : defaultMessage;
         this.name = nameProperty;
         if (Error.captureStackTrace) {
@@ -4187,6 +4188,7 @@ function RejectionError(message) {
     this.name = "RejectionError";
     this.message = message;
     this.cause = message;
+    this.isAsync = true;
 
     if (message instanceof Error) {
         this.message = message.message;
@@ -5260,7 +5262,7 @@ Promise.method = function Promise$_Method(fn) {
     };
 };
 
-Promise["try"] = Promise.attempt = function Promise$_Try(fn, args, ctx) {
+Promise.attempt = Promise["try"] = function Promise$_Try(fn, args, ctx) {
 
     if (typeof fn !== "function") {
         return apiRejection("fn must be a function");
@@ -8230,9 +8232,7 @@ module.exports = function(Promise, INTERNAL) {
             ms = value;
             value = void 0;
         }
-        if ((ms | 0) !== ms || ms < 0) {
-            return apiRejection("expecting a positive integer");
-        }
+        ms = +ms;
         if (typeof caller !== "function") {
             caller = Promise.delay;
         }
@@ -8265,9 +8265,7 @@ module.exports = function(Promise, INTERNAL) {
     };
 
     Promise.prototype.timeout = function Promise$timeout(ms, message) {
-        if ((ms | 0) !== ms || ms < 0) {
-            return apiRejection("expecting a positive integer");
-        }
+        ms = +ms;
 
         var ret = new Promise(INTERNAL);
         ret._setTrace(this.timeout, this);
@@ -8912,7 +8910,7 @@ var captureStackTrace = (function stackDetection() {
         typeof "".startsWith === "function" &&
         (err.stack.startsWith("stackDetection@")) &&
         stackDetection.name === "stackDetection") {
-
+        
         defineProperty(Error, "stackTraceLimit", {
             writable: true,
             enumerable: false,
@@ -9745,7 +9743,7 @@ Promise.method = function Promise$_Method(fn) {
     };
 };
 
-Promise["try"] = Promise.attempt = function Promise$_Try(fn, args, ctx) {
+Promise.attempt = Promise["try"] = function Promise$_Try(fn, args, ctx) {
 
     if (typeof fn !== "function") {
         return apiRejection("fn must be a function");
diff --git a/js/browser/bluebird.js b/js/browser/bluebird.js
index 8e01a4251..b6304c869 100644
--- a/js/browser/bluebird.js
+++ b/js/browser/bluebird.js
@@ -1,5 +1,5 @@
 /**
- * bluebird build version 1.0.0
+ * bluebird build version 1.0.1
  * Features enabled: core, timers, race, any, call_get, filter, generators, map, nodeify, promisify, props, reduce, settle, some, progress, cancel, synchronous_inspection
 */
 /**
@@ -584,7 +584,7 @@ var captureStackTrace = (function stackDetection() {
         typeof "".startsWith === "function" &&
         (err.stack.startsWith("stackDetection@")) &&
         stackDetection.name === "stackDetection") {
-
+        
         defineProperty(Error, "stackTraceLimit", {
             writable: true,
             enumerable: false,
@@ -885,7 +885,7 @@ function ensureNotHandled(reason) {
 
 function markAsOriginatingFromRejection(e) {
     try {
-        notEnumerableProp(e, "__rejectionError__", RejectionError);
+        notEnumerableProp(e, "isAsync", true);
     }
     catch(ignore) {}
 }
@@ -893,7 +893,7 @@ function markAsOriginatingFromRejection(e) {
 function originatesFromRejection(e) {
     if (e == null) return false;
     return ((e instanceof RejectionError) ||
-        e["__rejectionError__"] === RejectionError);
+        e["isAsync"] === true);
 }
 
 function attachDefaultState(obj) {
@@ -923,6 +923,7 @@ function canAttach(obj) {
 
 function subError(nameProperty, defaultMessage) {
     function SubError(message) {
+        if (!(this instanceof SubError)) return new SubError(message);
         this.message = typeof message === "string" ? message : defaultMessage;
         this.name = nameProperty;
         if (Error.captureStackTrace) {
@@ -948,6 +949,7 @@ function RejectionError(message) {
     this.name = "RejectionError";
     this.message = message;
     this.cause = message;
+    this.isAsync = true;
 
     if (message instanceof Error) {
         this.message = message.message;
@@ -1993,7 +1995,7 @@ Promise.method = function Promise$_Method(fn) {
     };
 };
 
-Promise["try"] = Promise.attempt = function Promise$_Try(fn, args, ctx) {
+Promise.attempt = Promise["try"] = function Promise$_Try(fn, args, ctx) {
 
     if (typeof fn !== "function") {
         return apiRejection("fn must be a function");
@@ -4797,9 +4799,7 @@ module.exports = function(Promise, INTERNAL) {
             ms = value;
             value = void 0;
         }
-        if ((ms | 0) !== ms || ms < 0) {
-            return apiRejection("expecting a positive integer");
-        }
+        ms = +ms;
         if (typeof caller !== "function") {
             caller = Promise.delay;
         }
@@ -4832,9 +4832,7 @@ module.exports = function(Promise, INTERNAL) {
     };
 
     Promise.prototype.timeout = function Promise$timeout(ms, message) {
-        if ((ms | 0) !== ms || ms < 0) {
-            return apiRejection("expecting a positive integer");
-        }
+        ms = +ms;
 
         var ret = new Promise(INTERNAL);
         ret._setTrace(this.timeout, this);
diff --git a/js/debug/captured_trace.js b/js/debug/captured_trace.js
index 1c0b50b1f..161c40e05 100644
--- a/js/debug/captured_trace.js
+++ b/js/debug/captured_trace.js
@@ -181,7 +181,7 @@ var captureStackTrace = (function stackDetection() {
         typeof "".startsWith === "function" &&
         (err.stack.startsWith("stackDetection@")) &&
         stackDetection.name === "stackDetection") {
-
+        
         defineProperty(Error, "stackTraceLimit", {
             writable: true,
             enumerable: false,
diff --git a/js/debug/errors.js b/js/debug/errors.js
index c958bf94f..c2e7e79b5 100644
--- a/js/debug/errors.js
+++ b/js/debug/errors.js
@@ -59,7 +59,7 @@ function ensureNotHandled(reason) {
 
 function markAsOriginatingFromRejection(e) {
     try {
-        notEnumerableProp(e, "__rejectionError__", RejectionError);
+        notEnumerableProp(e, "isAsync", true);
     }
     catch(ignore) {}
 }
@@ -67,7 +67,7 @@ function markAsOriginatingFromRejection(e) {
 function originatesFromRejection(e) {
     if (e == null) return false;
     return ((e instanceof RejectionError) ||
-        e["__rejectionError__"] === RejectionError);
+        e["isAsync"] === true);
 }
 
 function attachDefaultState(obj) {
@@ -97,6 +97,7 @@ function canAttach(obj) {
 
 function subError(nameProperty, defaultMessage) {
     function SubError(message) {
+        if (!(this instanceof SubError)) return new SubError(message);
         this.message = typeof message === "string" ? message : defaultMessage;
         this.name = nameProperty;
         if (Error.captureStackTrace) {
@@ -122,6 +123,7 @@ function RejectionError(message) {
     this.name = "RejectionError";
     this.message = message;
     this.cause = message;
+    this.isAsync = true;
 
     if (message instanceof Error) {
         this.message = message.message;
diff --git a/js/debug/promise.js b/js/debug/promise.js
index 0c5aa0f4f..c6c5c03cf 100644
--- a/js/debug/promise.js
+++ b/js/debug/promise.js
@@ -306,7 +306,7 @@ Promise.method = function Promise$_Method(fn) {
     };
 };
 
-Promise["try"] = Promise.attempt = function Promise$_Try(fn, args, ctx) {
+Promise.attempt = Promise["try"] = function Promise$_Try(fn, args, ctx) {
 
     if (typeof fn !== "function") {
         return apiRejection("fn must be a function");
diff --git a/js/debug/timers.js b/js/debug/timers.js
index 513e2444e..04ebaf640 100644
--- a/js/debug/timers.js
+++ b/js/debug/timers.js
@@ -63,9 +63,7 @@ module.exports = function(Promise, INTERNAL) {
             ms = value;
             value = void 0;
         }
-        if ((ms | 0) !== ms || ms < 0) {
-            return apiRejection("expecting a positive integer");
-        }
+        ms = +ms;
         if (typeof caller !== "function") {
             caller = Promise.delay;
         }
@@ -98,9 +96,7 @@ module.exports = function(Promise, INTERNAL) {
     };
 
     Promise.prototype.timeout = function Promise$timeout(ms, message) {
-        if ((ms | 0) !== ms || ms < 0) {
-            return apiRejection("expecting a positive integer");
-        }
+        ms = +ms;
 
         var ret = new Promise(INTERNAL);
         ret._setTrace(this.timeout, this);
diff --git a/js/main/captured_trace.js b/js/main/captured_trace.js
index f5bd20a76..524ebb9d2 100644
--- a/js/main/captured_trace.js
+++ b/js/main/captured_trace.js
@@ -172,7 +172,7 @@ var captureStackTrace = (function stackDetection() {
         typeof "".startsWith === "function" &&
         (err.stack.startsWith("stackDetection@")) &&
         stackDetection.name === "stackDetection") {
-
+        
         defineProperty(Error, "stackTraceLimit", {
             writable: true,
             enumerable: false,
diff --git a/js/main/errors.js b/js/main/errors.js
index c958bf94f..c2e7e79b5 100644
--- a/js/main/errors.js
+++ b/js/main/errors.js
@@ -59,7 +59,7 @@ function ensureNotHandled(reason) {
 
 function markAsOriginatingFromRejection(e) {
     try {
-        notEnumerableProp(e, "__rejectionError__", RejectionError);
+        notEnumerableProp(e, "isAsync", true);
     }
     catch(ignore) {}
 }
@@ -67,7 +67,7 @@ function markAsOriginatingFromRejection(e) {
 function originatesFromRejection(e) {
     if (e == null) return false;
     return ((e instanceof RejectionError) ||
-        e["__rejectionError__"] === RejectionError);
+        e["isAsync"] === true);
 }
 
 function attachDefaultState(obj) {
@@ -97,6 +97,7 @@ function canAttach(obj) {
 
 function subError(nameProperty, defaultMessage) {
     function SubError(message) {
+        if (!(this instanceof SubError)) return new SubError(message);
         this.message = typeof message === "string" ? message : defaultMessage;
         this.name = nameProperty;
         if (Error.captureStackTrace) {
@@ -122,6 +123,7 @@ function RejectionError(message) {
     this.name = "RejectionError";
     this.message = message;
     this.cause = message;
+    this.isAsync = true;
 
     if (message instanceof Error) {
         this.message = message.message;
diff --git a/js/main/promise.js b/js/main/promise.js
index 97ed62568..888914e62 100644
--- a/js/main/promise.js
+++ b/js/main/promise.js
@@ -302,7 +302,7 @@ Promise.method = function Promise$_Method(fn) {
     };
 };
 
-Promise["try"] = Promise.attempt = function Promise$_Try(fn, args, ctx) {
+Promise.attempt = Promise["try"] = function Promise$_Try(fn, args, ctx) {
 
     if (typeof fn !== "function") {
         return apiRejection("fn must be a function");
diff --git a/js/main/timers.js b/js/main/timers.js
index 513e2444e..04ebaf640 100644
--- a/js/main/timers.js
+++ b/js/main/timers.js
@@ -63,9 +63,7 @@ module.exports = function(Promise, INTERNAL) {
             ms = value;
             value = void 0;
         }
-        if ((ms | 0) !== ms || ms < 0) {
-            return apiRejection("expecting a positive integer");
-        }
+        ms = +ms;
         if (typeof caller !== "function") {
             caller = Promise.delay;
         }
@@ -98,9 +96,7 @@ module.exports = function(Promise, INTERNAL) {
     };
 
     Promise.prototype.timeout = function Promise$timeout(ms, message) {
-        if ((ms | 0) !== ms || ms < 0) {
-            return apiRejection("expecting a positive integer");
-        }
+        ms = +ms;
 
         var ret = new Promise(INTERNAL);
         ret._setTrace(this.timeout, this);
diff --git a/js/zalgo/captured_trace.js b/js/zalgo/captured_trace.js
index f5bd20a76..524ebb9d2 100644
--- a/js/zalgo/captured_trace.js
+++ b/js/zalgo/captured_trace.js
@@ -172,7 +172,7 @@ var captureStackTrace = (function stackDetection() {
         typeof "".startsWith === "function" &&
         (err.stack.startsWith("stackDetection@")) &&
         stackDetection.name === "stackDetection") {
-
+        
         defineProperty(Error, "stackTraceLimit", {
             writable: true,
             enumerable: false,
diff --git a/js/zalgo/errors.js b/js/zalgo/errors.js
index c958bf94f..c2e7e79b5 100644
--- a/js/zalgo/errors.js
+++ b/js/zalgo/errors.js
@@ -59,7 +59,7 @@ function ensureNotHandled(reason) {
 
 function markAsOriginatingFromRejection(e) {
     try {
-        notEnumerableProp(e, "__rejectionError__", RejectionError);
+        notEnumerableProp(e, "isAsync", true);
     }
     catch(ignore) {}
 }
@@ -67,7 +67,7 @@ function markAsOriginatingFromRejection(e) {
 function originatesFromRejection(e) {
     if (e == null) return false;
     return ((e instanceof RejectionError) ||
-        e["__rejectionError__"] === RejectionError);
+        e["isAsync"] === true);
 }
 
 function attachDefaultState(obj) {
@@ -97,6 +97,7 @@ function canAttach(obj) {
 
 function subError(nameProperty, defaultMessage) {
     function SubError(message) {
+        if (!(this instanceof SubError)) return new SubError(message);
         this.message = typeof message === "string" ? message : defaultMessage;
         this.name = nameProperty;
         if (Error.captureStackTrace) {
@@ -122,6 +123,7 @@ function RejectionError(message) {
     this.name = "RejectionError";
     this.message = message;
     this.cause = message;
+    this.isAsync = true;
 
     if (message instanceof Error) {
         this.message = message.message;
diff --git a/js/zalgo/promise.js b/js/zalgo/promise.js
index 775a1e30c..6f4c0dd1c 100644
--- a/js/zalgo/promise.js
+++ b/js/zalgo/promise.js
@@ -302,7 +302,7 @@ Promise.method = function Promise$_Method(fn) {
     };
 };
 
-Promise["try"] = Promise.attempt = function Promise$_Try(fn, args, ctx) {
+Promise.attempt = Promise["try"] = function Promise$_Try(fn, args, ctx) {
 
     if (typeof fn !== "function") {
         return apiRejection("fn must be a function");
diff --git a/js/zalgo/timers.js b/js/zalgo/timers.js
index 513e2444e..04ebaf640 100644
--- a/js/zalgo/timers.js
+++ b/js/zalgo/timers.js
@@ -63,9 +63,7 @@ module.exports = function(Promise, INTERNAL) {
             ms = value;
             value = void 0;
         }
-        if ((ms | 0) !== ms || ms < 0) {
-            return apiRejection("expecting a positive integer");
-        }
+        ms = +ms;
         if (typeof caller !== "function") {
             caller = Promise.delay;
         }
@@ -98,9 +96,7 @@ module.exports = function(Promise, INTERNAL) {
     };
 
     Promise.prototype.timeout = function Promise$timeout(ms, message) {
-        if ((ms | 0) !== ms || ms < 0) {
-            return apiRejection("expecting a positive integer");
-        }
+        ms = +ms;
 
         var ret = new Promise(INTERNAL);
         ret._setTrace(this.timeout, this);
diff --git a/package.json b/package.json
index 329b7d8e5..d38407a1a 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
     "name": "bluebird",
     "description": "Full featured Promises/A+ implementation with exceptionally good performance",
-    "version": "1.0.0",
+    "version": "1.0.1",
     "keywords": [
         "promise",
         "performance",