8.4.0

Bug Fixes

• string: initWithBytes instead of UTF8 string (b72dcf6)
• support null characters on NSString marshalling (705346f)

Features

• drop perIsolateCaches_ in favor of v8 data slots (44daeb3)
• inline frequently used methods, add caches, thread safety, and use static allocation when possible (44e60d0)
• use spinlocks for selector maps (c5a8863)

Performance Improvements

• use fast primitive setters (#181) (47c63b0)