Ruby: wrapper types initialized to zero do not correctly serialize as json

[fables-tales]

$ cat Gemfile.lock
GEM
  remote: https://rubygems.org/
  specs:
    google-protobuf (3.9.2)

PLATFORMS
  ruby

DEPENDENCIES
  google-protobuf

BUNDLED WITH
   2.0.2
$ cat hi.rb
require 'google/protobuf'
require 'google/protobuf/wrappers_pb'
Google::Protobuf::DescriptorPool.generated_pool.build do
  add_message "Henlo" do
    optional :resource_name, :message, 1, "google.protobuf.Int32Value"
    optional :name, :string, 2
  end
end

Henlo  = Google::Protobuf::DescriptorPool.generated_pool.lookup("Henlo").msgclass

puts Henlo.new(name: "hi").to_json
puts Henlo.new(name: "hi", resource_name: Google::Protobuf::Int32Value.new(value: 0)).to_json
puts Henlo.new(name: "hi", resource_name: Google::Protobuf::Int32Value.new(value: 1)).to_json
$ bundle exec ruby hi.rb
{"name":"hi"}
{"resourceName":,"name":"hi"}
{"resourceName":1,"name":"hi"}

I would have expected the middle line to be {"resourceName": 0,"name":"hi"}

[sandlerben]

+1, also seeing this

[sandlerben]

See also #6903