PhpSpreadsheet/tests/data/Cell/DefaultValueBinder.php

<?php

return [
    [[null], 'null'],
    [['#NULL!'], 'e'],
    [[false], 'b'],
    [[true], 'b'],
    [['FALSE'], 's'],
    [['TRUE'], 's'],
    [[''], 's'],
    [['ABC'], 's'],
    [['123'], 'n'],
    [[123], 'n'],
    [[0.123], 'n'],
    [['-123'], 'n'],
    [['1.23E4'], 'n'],
    [['-1.23E4'], 'n'],
    [['1.23E-4'], 'n'],
    [['000123'], 's'],
    [['=123'], 'f'],
    [['#DIV/0!'], 'e'],
];