Merge branch 'feature/v1.1.5接口补充2' into develop

zhaojs

2023-08-02 6bf09b5ad960fd4e657c132f9e451c487aa4d9c7

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<?php
 
namespace PhpOffice\PhpSpreadsheet;
 
interface IComparable
{
    /**
     * Get hash code.
     *
     * @return string Hash code
     */
    public function getHashCode();
}