Version 0.2.6 correctly converts `e^+e^-` into `e⁺e⁻`. Version 0.2.7 and 0.3.0 convert the same input to `e⁺e^(−)` instead.
Version 0.2.6 correctly converts
e^+e^-intoe⁺e⁻. Version 0.2.7 and 0.3.0 convert the same input toe⁺e^(−)instead.