- Increased network response buffer size from 4kb to 8kb.
- Removed "ondatastream" event's undocumented "blob" property.
  * Improves performance by avoiding an extra buffer copy.
  * Note that iOS does not support this undocumented API.
- Modified "responseText" property to only create a string when accessed.
  * Major performance improvement. No longer transcodes per response buffer.
  * Fixed "responseText" to provide total text downloaded like iOS instead of only the buffered segment's text.