Author here. The language has still many inconsistencies but not these ones.

Import functions is done the same way:

  func foo(a: Int): Int
  import func foo(Int): Int

May be the doc is outdated.

The multiple declaration is consistent with assignment:

  var w, h = 640, 480
  w, h = 640, 680
  w, h = getBoundingBox(obj)

The syntax

  var a = Int: 32

is unusual compared to many other languages because it just use a simple syntax:

  var id = expr

The type is prefixed only to resolve literals:

  var a = Int32: 42
  var b = Uint8: 42

It can be useful in generic functions:

  println("The answer is \a", Float32: 42)

But to create uninitialized variables I had to keep the syntax:

  var id: Type