google-cloud-translate gemの翻訳結果でアポストロフィが実体参照(')で返ってきてしまう問題

遭遇したver

google-cloud-translate (3.2.3)
google-cloud-translate-v2 (0.3.1)
google-cloud-translate-v3 (0.4.2)

現象

text = "お腹空いた"

response = Google::Cloud::Translate.translation_service.translate_text(
  contents:             [text],
  target_language_code: "en",
  parent:               YOUR_GOOGLE_CLOUD_PROJECT_ID
)

translate_result = response.translations.first
puts translate_result.translated_text
#=> "I'm hungry"

解決法1: 返ってきたものをunescapeする

text = "お腹空いた"

response = Google::Cloud::Translate.translation_service.translate_text(
  contents:             [text],
  target_language_code: "en",
  parent:               YOUR_GOOGLE_CLOUD_PROJECT_ID
)

translate_result = response.translations.first
puts CGI.unescapeHTML(translate_result.translated_text)
#=> "I'm hungry"

解決法2: mime_typeにtext/plainを指定してAPIを使う

ここのIssueのやりとりで見つけました。
https://github.com/googleapis/google-cloud-ruby/issues/4775

text = "お腹空いた"

response = Google::Cloud::Translate.translation_service.translate_text(
  contents:             [text],
  target_language_code: "en",
  parent:               YOUR_GOOGLE_CLOUD_PROJECT_ID,
  mime_type:            'text/plain' # これを追加
)

translate_result = response.translations.first
puts translate_result.translated_text
#=> "I'm hungry"