Gracefully handle UTF-8 in Live Preview

[homersimpsons]

It would be a great addition to handle UTF-8 correctly in Live Preview.

I wanted to diagnose some UTF-8 related things but the output is not readable in live-preview: https://3v4l.org/ZsUDp

string(14) "μεθοδοσ"

Note that it is readable when pressing "eval();" button:

Thank you for this awesome project!