CI failure when testing sending arrays

Observed this failure on the OSX test for #112:

     Testing Running tests...
Test Failed at /Users/runner/work/Distributed.jl/Distributed.jl/test/distributed_exec.jl:409
  Expression: a == remotecall_fetch((x->begin
                #= /Users/runner/work/Distributed.jl/Distributed.jl/test/distributed_exec.jl:409 =#
                x
            end), id_other, a)
   Evaluated: [0.5946357748689605, 0.7048341678636187, 0.9572888290215604, 0.18264029042455987, 0.4384192573227691, 0.22157930479824584, 0.4315750395313456, 0.4425032613947064, 0.37243488252060664, 0.5397596313913603  …  0.5294886907150608, 0.9330856005741858, 0.45975178468362765, 0.8296207877110172, 0.9851407263085724, 0.9853470888125861, 0.9571076854720877, 0.35202745408110114, 0.35773654285097367, 0.9171232230632897] == [0.5946357748689605, 0.7048341678636187, 0.9572888290215604, 0.18264029042455987, 0.4384192573227691, 0.22157930479824584, 0.4315750395313456, 0.4425032613947064, 0.37243488252060664, 0.5397596313913603  …  0.5294886907150608, 0.9330856005741858, 0.45975178468362765, 0.8296207877110172, 0.9851407263085724, 0.9853470888125861, 0.9571076854720877, 0.35202745408110114, 0.35773654285097367, 0.9171232230632897]

Test Failed at /Users/runner/work/Distributed.jl/Distributed.jl/test/distributed_exec.jl:419
  Expression: [fetch(rr) for rr = rr_list] == [:OK for x = 1:ntasks]
   Evaluated: [:OK, :OK, :ERROR, :OK, :OK, :OK, :OK, :OK, :OK, :OK] == [:OK, :OK, :OK, :OK, :OK, :OK, :OK, :OK, :OK, :OK]

ERROR: LoadError: There was an error during testing
in expression starting at /Users/runner/work/Distributed.jl/Distributed.jl/test/distributed_exec.jl:419
ERROR: LoadError: Distributed test failed, cmd : `/Users/runner/hostedtoolcache/julia/nightly/x64/bin/julia -C native -J/Users/runner/hostedtoolcache/julia/nightly/x64/lib/julia/sys.dylib -g1 --code-coverage=@/Users/runner/work/Distributed.jl/Distributed.jl --color=yes --startup-file=no --check-bounds=yes --startup-file=no --depwarn=error /Users/runner/work/Distributed.jl/Distributed.jl/test/distributed_exec.jl`
Stacktrace:
 [1] error(s::String)
   @ Base ./error.jl:44
 [2] top-level scope
   @ ~/work/Distributed.jl/Distributed.jl/test/runtests.jl:11
 [3] include(mapexpr::Function, mod::Module, _path::String)
   @ Base ./Base.jl:301
 [4] top-level scope
   @ none:6
 [5] eval(m::Module, e::Any)
   @ Core ./boot.jl:461
 [6] exec_options(opts::Base.JLOptions)
   @ Base ./client.jl:295
 [7] _start()
   @ Base ./client.jl:558
in expression starting at /Users/runner/work/Distributed.jl/Distributed.jl/test/runtests.jl:10
Package Distributed errored during testing

Start by reproducing the OSX failure in test/distributed_exec.jl, focusing on the assertions at lines 409 and 419, and run the test/runtests.jl entry point shown in the report. The work is done when the array round-trip comparison and all remote task results pass consistently in the affected CI test.