alphagov/performance-datastore — pull request #15 by jabley (2014-10-31 12:35:51+00:00)
Title: Rework request customisation

I’d independently discovered Variadic configuration, but variadic
functional configuration seems to be better.

See http://dave.cheney.net/2014/10/17/functional-options-for-friendly-apis
and http://commandcenter.blogspot.com.au/2014/01/self-referential-functions-and-design.html