[shakna]

> The plus of "stringly API" is that you can save your queries in database, or get it through web interface

You can do the same with a function call, there's no difference, apart from already having a list of arguments to pass around. (And of course, the type uncertainty you get with a value stored in a string.)

> if you need a nested key value, you can use function:

Not sure why you're telling me that. What part of my comment are you responding to?