taoensso.tempura.impl/vargs should be customizable

[ai212983]

First for all, thanks for awesome library! It's damn quick and very flexible.

I have a suggestion though. I think taoensso.tempura.impl/vargs should be customizable via params, like resource-compiler.

Reason is custom resource compiler params are passed through vargs, which strips everything to vector. So supporting something like MessageFormat is not easy, because it works with map.

Of course, it's possible to workaround this by wrapping map into vector, like

(tr :message-format [{:fruit "Apple" :amount 2}])

and making a check inside of custom resource compiler, but that's a bit hack-ish.