PHPOffice/PHPExcel — pull request #349 by bobbysciacchitano (2014-04-08 02:00:42+00:00)
Title: Allow value of 0 to be passed into POISSON formula

Excel 2007 accepts a value of 0 in the POISSON formula. The corresponding validations in PHP Excel returns a NaN error.

Example =POISSON(0, 0.263334117, FALSE) expected value is 0.768485091.