CI failure when testing sending arrays

[JamesWrigley]

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

[JamesWrigley]

And right on cue, saw the same failure in DistributedNext: https://github.com/JuliaParallel/DistributedNext.jl/actions/runs/12299523074/job/34325513066#step:6:182

Test Failed at /Users/runner/work/DistributedNext.jl/DistributedNext.jl/test/distributed_exec.jl:405
  Expression: a == remotecall_fetch((x->begin
                x
            end), id_other, a)
   Evaluated: [0.7247664866632146, 0.7233244841336156, 0.043397417356879076, 0.9067528703991048, 0.02463415696815996, 0.7259889371220457, 0.4140250502580204, 0.2959178634415417, 0.8350653566760314, 0.7984436735527652  …  0.3925621603133145, 0.9701006030812743, 0.5657417436270215, 0.17838776707652815, 0.34987041939842456, 0.6526825609065877, 0.13817711551558398, 0.43191492304154255, 0.16308821087407377, 0.608484627106591] == [0.7247664866632146, 0.7233244841336156, 0.043397417356879076, 0.9067528703991048, 0.02463415696815996, 0.7259889371220457, 0.4140250502580204, 0.2959178634415417, 0.8350653566760314, 0.7984436735527652  …  0.3925621603133145, 0.9701006030812743, 0.5657417436270215, 0.17838776707652815, 0.34987041939842456, 0.6526825609065877, 0.13817711551558398, 0.43191492304154255, 0.16308821087407377, 0.608484627106591]

@distributed and [un]buffered reads: Test Failed at /Users/runner/work/DistributedNext.jl/DistributedNext.jl/test/distributed_exec.jl:415
  Expression: [fetch(rr) for rr = rr_list] == [:OK for x = 1:ntasks]
   Evaluated: [:OK, :OK, :OK, :OK, :OK, :OK, :OK, :ERROR, :OK, :OK] == [:OK, :OK, :OK, :OK, :OK, :OK, :OK, :OK, :OK, :OK]

Stacktrace:
 [1] macro expansion
   @ ~/hostedtoolcache/julia/1.9.4/x64/share/julia/stdlib/v1.9/Test/src/Test.jl:478 [inlined]
 [2] macro expansion
   @ ~/work/DistributedNext.jl/DistributedNext.jl/test/distributed_exec.jl:415 [inlined]
 [3] macro expansion
   @ ~/hostedtoolcache/julia/1.9.4/x64/share/julia/stdlib/v1.9/Test/src/Test.jl:1498 [inlined]
 [4] top-level scope
   @ ~/work/DistributedNext.jl/DistributedNext.jl/test/distributed_exec.jl:369
Test Summary:                       | Pass  Fail  Total   Time
@distributed and [un]buffered reads |    8     1      9  10.2s