There doesn't appear to be font hinting for all the super and subscript numbers: ⁰¹²³⁴⁵⁶⁷⁸⁹₀₁₂₃₄₅₆₇₈₉ On my system (Ubuntu, ttf-dejavu 2.29-2) the numbers 1-4 show clearly while the others do not. I am using these symbols in mathematical formulas.
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