filter - LeFreq/Singularity GitHub Wiki
To ease re-use, data in can be filtered in some interesting way before heading to the object(s) for transformation. A filter could potentially pre-sort a bunch of objects, for example, and send different inputs to different objects.
Filters are generally for cleaning inputs to form a uniform data stream for input to objects, whereas decorators are for making data usable by humans.
In the data ecosystem, filter can decide what level/trustlist of messages get through. A special filter function and associated update set commands can move a node up or down in trust, similarly with objects to other objects.
See also: