Arrange for handler bodies to be floated
Arrange for handler bodies to be floated

- There is currently a bit of indirection. Handle blocks delay
  evaluation so that the delayed value can be passed to a handler
  setup function. So, any non-trivial computation has to be floated
  into a form that can be delayed.

unisonweb/platform,unisonweb/platform,unisonweb/platform