fixup! Add type-stable spawn code paths

Author: jpsamaroo

src/submission.jl

@@ -326,7 +326,7 @@ function eager_launch!(pair::DTaskPair)
                                         fargs, spec.options, true))
     task.thunk_ref = thunk_id.ref
 end
-@warn "Don't convert Tuple to Vector{Argument}" maxlog=1
+# FIXME: Don't convert Tuple to Vector{Argument}
 function eager_launch!(pairs::Vector{DTaskPair})
     ntasks = length(pairs)