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Ali Satwat KhanChristian Clausspre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>* fix: raise ValueError in encode() for non-lowercase input encode() previously accepted uppercase letters, digits, and other non-lowercase characters silently, producing incorrect/out-of-range values (e.g. negative numbers for uppercase letters) instead of failing. Add input validation using str.islower() and str.isalpha() to raise a ValueError when the input isn't purely lowercase a-z. Added a doctest covering the new error case. * resolved doctest * Fix Ruff 0.16 lint failures * Enhance encode function error handling examples Update error handling in encode function to include examples for mixed case and invalid characters. * Fix indentation in test_cancer_data function * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci --------- Co-authored-by: Christian Clauss <cclauss@me.com> Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>