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A lightweight library to algorithmically convert numerical tone notation (e.g., hao3) to standard Pinyin diacritical marks (e.g., hǎo).

There is one key difference between v1 and v2: v2 does not support the format pinyin-number-r (e.g., hua1r) for erhua pronunciation. Instead, it supports the format pinyin-r-number, such as huar1.