Infer types of default function parameters

Hi all,

this is a rather minor nitpick, I'm just looking for some opinions on this.

Declaring a function that has default parameters currently looks like this:

func foo(bar: String = "baz") {

Now I'm wondering if there would be any problems if it were possible to omit the type annotation for default params and let Swift's type inference handle that.

func foo(bar = "baz") {

It feels to be equivalent to omitting type annotations with variable declarations. Obviously more complex types would still require annotations being specified. Off the top of my head I can't think of any negative ramifications this might bring, be it in simple function/method declarations or protocol extensions and elsewhere.
Any further input on this would be much appreciated :)