* Allow different names for ...rest
* Resolves#3945
* This change requires an explicit name for the rest argument in `WholeStreamCommand`,
which is why there are so many changed files.
* Remove redundant clone
* Add tests
* kind of works but not what we really want
* updated `into binary` and `first` to work better together
* attempt to fix wasm build problem
* attempt #2 to fix wasm stuff
