['exception'], 'boolean argument' => ['#VALUE!', true], 'slash as group separator' => [1234567.1, '1/234/567.1', '.', '/'], 'slash as decimal separator' => [1234567.1, '1,234,567/1', '/', ','], 'issue 3574 null string treated as 0' => [0, '', ',', ' '], 'issue 3574 one or more spaces treated as 0' => [0, ' ', ',', ' '], 'issue 3574 non-blank numeric string okay' => [2, ' 2 ', ',', ' '], 'issue 3574 non-blank non-numeric string invalid' => ['#VALUE!', ' x ', ',', ' '], ];