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Upgrade from 1.x to 2.0

  • Minimum PHP is 8.2 (^8.2).
  • Requires portphp/portphp ^2.0.
  • Writer methods use : void return types from the core interfaces.
  • Iterator methods on SpreadsheetReader use PHP 8 return types (mixed, void, etc.).
  • phpoffice/phpspreadsheet supports ^1.29 || ^2 || ^3 || ^4 || ^5 (uses coordinate API compatible with 2+).
  • CI is GitHub Actions (Travis/Scrutinizer removed).
  • PHPUnit 9 replaces the old PHPUnit 4 suite; phpspec is no longer a dependency.