P.J. Henning

Re: https://github.com/basarat/typescript-book/issues/623

The point of this is to have something that is more performant, at least in some cases, than having to check if `intersections` returns an array of `> 0`

Some references for how this can be accomplished in general: - https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.461.1828&rep=rep1&type=pdf - https://digitalscholarship.unlv.edu/cgi/viewcontent.cgi?article=3385&context=rtds - https://sites.google.com/site/turningfunctions/

Hello, it is possible to construct a `Concept` value, via the first constructor, which gives an object with no value for the `pos` field: https://github.com/dmeoli/WS4J/blob/44589e724e1bd4a2701dcaf1d5803eea00b2c610/src/main/java/edu/uniba/di/lacam/kdde/lexical_db/data/Concept.java#L12-L14 but code elsewhere that operates...

Via returned function