Merge release `v1.9.8` into main#13

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xulbux wants to merge 18 commits into

mainfrom

Commits on May 7, 2026

Unify all error messages & add a new option to allow the space separated `--flag value` format again
xulbux
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Add better typing for the arg values `.get()` method
xulbux
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Commits on May 10, 2026

Follow no-single-letter-names everywhere, remove redundant format code prefixes, reformat all docstrings & linting
xulbux
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Commits on May 12, 2026

Performance improvements for `Console.log()`, `Data.remove_duplicates()`, and `String.normalize_spaces()`
xulbux
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Commits on May 14, 2026

Commits on May 16, 2026