feature request: special form of tag to pass all in-arguments to nested tag

[bran]

a.html calls a tag tag1.html, which in turn calls another tag tag2.html. There should be a way in the tag1.html to pass all arguments from a.html to tag2

a.html:

#{tag1 a:1, b:2/}

tag1.html:

#{tag2 _:_ /}

I was thinking something like _:_, the Scala wildcard..