Question about fonts and fast loading

Hello,

I developed a clock face that uses the VGA8 font.
At the beginning I call:
require("FontVGA8").add(Graphics);.
I tried implementing fast loading so in the remove handler I call:
delete Graphics.prototype.setFontVGA8;

The problem is that I also have a widget that uses the VGA8 font. Now, even though the widget calls require("FontVGA8").add(Graphics); in the beginning of its own code as well, I get the error Unknown font VGA8.

Was I supposed to call delete Graphics.prototype.setFontVGA8;?