VertexFusor.new FlatJoinFunction() {...}

Element	Missed Instructions	Cov.	Missed Branches	Cov.	Missed	Cxty	Missed	Lines	Missed	Methods
Total	0 of 12	100%	1 of 2	50%	1	3	0	4	0	2
{...}		100%		n/a	0	1	0	1	0	1
join(LVertex, Tuple2, Collector)		100%		50%	1	2	0	3	0	1