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Public method "staabm\PHPStanBaselineAnalysis\ResultPrinter::getFilterKeyForString()" is never used

Method staabm\PHPStanBaselineAnalysis\ResultPrinter::getFilterKeyForString() should return 'Anonymous-Variables'|'Classes-Cognitive…'|'Date'|'Deprecations'|'Invalid-Phpdocs'|'Native-Param-Type…'|'Native-Property…'|'Native-Return-Type…'|'Overall-Errors'|'Unknown-Types'|'Unused-Symbols' but returns mixed.