yaml_emit method cannot dump Unicode characters

[maxsky]

This is result: - name: "\U0001F1ED\U0001F1F0香港", its escaped.

And this is Symfony\Component\Yaml library dump result: - name: '🇭🇰香港'

HK is an Emoji symbol, like this:

[bd808]

I think this is generally a complaint about the output formatting of unicode strings, but perhaps an example reproduction would make it more clear if that is the case or if there is a real bug hiding in this report.