Spark seems to use Unicode, but the font lacks many special characters.
In the Spark chat / text window, some characters display as an outline rectangle.
Please switch to a font that includes more glyphs.
Arial Unicode MS includes all of Unicode 2.0.0 but is now almost ten years old.
Segoe Symbol includes many glyphs, but Unicode is now at 8.0.
I don’t so much care about being about to CHANGE the font, but I’d sure like to to be able to see the characters on screen.
Would it be necessary to support the Unicode emoji (and other) modifiers? Not absolutely.
Of course it is most important to preserve the bits even if the glyphs are wrong.