Thorsten
"Since it is already lowercase, lower() would do nothing to 'ß'"
Exactly. Why would it? It is nonsensical to change an already lowercase character with a lowercase function.
Suggest to update to:
"For example, the Unicode standard for German lower case letter 'ß' prescribes full casefolding to 'ss'. Since it is already lowercase, lower() would do nothing to 'ß'; casefold() converts it to 'ss'.
In addition to full lowercasing, this function also expands ligatures, for example, 'fi' becomes 'fi'."
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