swap round arguments in new extract function

[lukeapage]

see

#1112 (comment)

[scottrippey]

@agatronic Was the extract function successfully merged into this branch? It looks like #1112 was closed without pulling, so do I need to create a new pull request?
Update: I think I'm caught up now ... I see that 1.4.0 has been merged into trunk, and the extract function was merged.

[scottrippey]

Since the extract function is now in 1.4.0, is swapping the args a breaking change?

[lukeapage]

@scottrippey no, 1.4.0 has not been released.. if you look at the milestone it is some way off. I've now also updated the dist folder to make it clear it is not a proper release.. so no breaking change :)