Psych.dump convert emoji characters into unicode

Hey! 🙌

The origin of this issue is i18n-tasks which delegates YAML dumping to this library.

I've spotted that i18n-tasks normalize converts emoji characters into unicode which makes them much harder to read and change afterward. IMHO, this should be necessary because yaml is capable to understand plain emoji chars. What do you think about this one?

Before

lang:
  de-de: 🇩🇪 German
  en-uk: 🇺🇸 English
  header: 🌐 Select Language

After i18n-tasks normalize / Psych.dump

lang:
  de-de: "\U0001F1E9\U0001F1EA German"
  en-uk: "\U0001F1FA\U0001F1F8 English"
  header: "\U0001F310 Select Language"

Converter tool

• https://r12a.github.io/app-conversion/

✨ Please let emojis live in yaml files. 💙 💚 💛 💜

Note This issue was moved from https://github.com/glebm/i18n-tasks/issues/291

Start at the Psych.dump entry point and reproduce the YAML output shown in the issue with emoji characters. Trace how those characters are serialized, then verify that completed output preserves readable emoji in YAML rather than converting them to Unicode escapes.