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A little hack inspired by this question on stackoverflow: http://stackoverflow.com/questions/10665933/removing-unsupported-unicode-characters-otherwise-shown-as-squares
Basically it draws in a canvas the codepoint you pass it and the 0xFFFF char (which should appear as a square) and compares both. It returns a likeness score. If it's 100 you have a match --> the character is not present in the font.