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A CSS identifier can't start with a digit, so when a folder name does, a '_' character is appended at the beginning of its CSS identifier. The check for this first character used the `isdigit()` function, which takes a `char` argument, while `[self objectAtIndex: 0]` returns a `unichar`, i.e. a 16-bit unsigned integer. This caused some non-digit characters to pass this check (e.g. Chinese characters), ending up with an underscore at the beginning of the folder name.