Due to a misreading (mine) for v9.3.0 I mis-documented the isFirst and isLast as being in-loop dot operators rather than additional new v9.3.0 keys in the per-link dictionary objects. Tripped over this today and Eastgate kindly spotted my error. The eachLink(loopVar[,scope]){actions} is now updated with corrected examples.
Clearly this feature isn’t heavily used as the error has been there, unnoticed, since v9.3.0 released. 