Personally, I don't call it a bug if people pass invalid arguments and it complains with an exception; but I've made some basic changes to support DateTime objects and objects with a __toString() method... Any other objects will throw a catchable fatal error, and it's up to user code to implement any exception handler to convert it to an exception and handle it
SUMIF() condition can have double quote, such as '=SUMIF(A2:A4,">""",B2:B4)'.
This formula purpose is to compare the character double quote (").
In our previous patch (commit f1a1f525) we wrongly assumed that
PHPExcel_Calculation_MathTrig::SUMIF() expected the condition to escaped ('>""'),
but this is actually not the case in real use of PHPExcel, so the unit tests were
modified accordingly to use non-escaped condition ('>"').
Excel, Gnumeric and Google Spreadsheet are case insensitive, so the
default behavior of PHPExcel is modified accordingly.
However OpenOffice is case sensitive and is also supported via the
compatibility mode of PHPExcel.
Fixes#31
SUMIF() should handle double quotes properly in both criteria and
cells values. This is especially useful when we need to compare string
containing themselve double quote(s).
MarkBaker