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@@ -79,7 +79,7 @@ class PHPExcel_Cell_DefaultValueBinder implements PHPExcel_Cell_IValueBinder
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return PHPExcel_Cell_DataType::TYPE_STRING;
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} elseif ($pValue instanceof PHPExcel_RichText) {
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return PHPExcel_Cell_DataType::TYPE_INLINE;
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- } elseif ($pValue{0} === '=' && strlen($pValue) > 1) {
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+ } elseif (!is_int($pValue) && $pValue[0] === '=' && strlen($pValue) > 1) {
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return PHPExcel_Cell_DataType::TYPE_FORMULA;
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} elseif (is_bool($pValue)) {
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return PHPExcel_Cell_DataType::TYPE_BOOL;
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