Needle-extras is an add-on library to needle, providing additional services and functionality beyond what the core needle system provides.

this is a kind of testbed of new services and techniques. if a service in needle-extras is found to be particularly valuable, it may be promoted into the core needle framework.

currently this includes a form of interface injection (thanks to christian neukirchen), a simplified means of depending on third-party services, and a general multicasting service.