not working with Chinese or Emoji when style is osx-notifier

[cosven]

(setq alert-default-style 'osx-notifier)
(alert "haha")
(alert "棒")
(alert "😄")

The second expression works as expected, however, the third and fourth will fail.

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It seems that we do not need encoding here: https://github.com/jwiegley/alert/blob/master/alert.el#L862

[failable]

Any news of this?