Allow recursive root-level wildcards

[quazgar]

I have found #4, but I could not find a way to select elements at any level.

For example, here I might want to operate on all foo elements:

{
  "foo": 1,
  "bar": {
    "foo": 2
  }
}

• foo only gives 1
• *.foo only gives 2

For my use cases, it would be great to have something like **.foo which would give both occurrences.