fork with exit [some integer] seems to not change exitstatus in Process.wait2, ruby 2.2.4

Happy New Year ruby-talk.

I'm attempting to retrieve the exit status of child processes. So far, no
matter how the child process exists, wait2 status only has a 1 for
exitstatus.

I'm also seeing "unexpected throw" messages. Perhaps I'm doing something
that is causing the unexpected throw, which is causing the exit status to
be 1.

ruby:
    interpreter:  "ruby"
    version:      "2.4.4p296"
    date:         "2018-03-28"
    platform:     "x86_64-darwin17"
    patchlevel:   "2018-03-28 revision 63013"
    full_version: "ruby 2.4.4p296 (2018-03-28 revision 63013)
[x86_64-darwin17]"

OSX: 10.13.6 (17G4015)

sample code:

pid = fork do
  sleep 2
  exit 555
end

returned_pid, status = Process.wait2

puts "pid: #{pid}, returned_pid: #{returned_pid}, status:
#{status.inspect}, exitstatus: #{status.exitstatus}"

pid = fork do
  sleep 2
  exit 0
end

returned_pid, status = Process.wait2

puts "pid: #{pid}, returned_pid: #{returned_pid}, status:
#{status.inspect}, exitstatus: #{status.exitstatus}"


Session:

2.4.4 :001 > pid = fork do

2.4.4 :002 >       sleep 2
2.4.4 :003?>     exit 555
2.4.4 :004?>   end
 => 91187
2.4.4 :005 >
2.4.4 :006 >   returned_pid, status = Process.wait2
(irb):1:in `fork': unexpected throw
 => [91187, #<Process::Status: pid 91187 exit 1>]
2.4.4 :007 >
2.4.4 :008 >   puts "pid: #{pid}, returned_pid: #{returned_pid},
status: #{status.inspect}, exitstatus: #{status.exitstatus}"
pid: 91187, returned_pid: 91187, status: #<Process::Status: pid 91187
exit 1>, exitstatus: 1
 => nil
2.4.4 :009 >
2.4.4 :010 >   pid = fork do
2.4.4 :011 >       sleep 2
2.4.4 :012?>     exit 0
2.4.4 :013?>   end
 => 91188
2.4.4 :014 >
2.4.4 :015 >   returned_pid, status = Process.wait2
(irb):10:in `fork': unexpected throw
 => [91188, #<Process::Status: pid 91188 exit 1>]
2.4.4 :016 >
2.4.4 :017 >   puts "pid: #{pid}, returned_pid: #{returned_pid},
status: #{status.inspect}, exitstatus: #{status.exitstatus}"
pid: 91188, returned_pid: 91188, status: #<Process::Status: pid 91188
exit 1>, exitstatus: 1
 => nil





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