* Slk Shared Formulas
Fix#2267. The Slk format has a way to express a "shared formula", but the Slk reader does not yet understand it. Thanks to @SheetJSDev for documenting the problem and pointing the way towards a solution. It has taken a long time to get there. Part of the problem is that I have not been successful in getting Excel to use this type of construction when saving a Slk file. So I have resorted to saving a Slk file where shared formulas *could* be used, and then editing it by hand to actually use them. It would not surprise me in the least to have neglected one or more possible ways to specify a shared formula; but, at least the issue as documented is resolved, and if new issues arise, we'll probably be in better shape to deal with them.
* Update CHANGELOG.md
Fix#3658. Readers will call `setCalculatedValue` to save the original calculated value for a cell that contains a formula; this affects the result of `getOldCalculatedValue`. The set routine automatically casts numeric values to float, which is not appropriate when the calculated value is explicitly set to a string type. An optional parameter is added to the set routine to indicate whether a cast is appropriate (default is true so userland uses of this method will remain unaffected). The readers for Xlsx, Xls, Xml, Ods, and Slk are all changed to set the new parameter appropriately. Gnumeric saves the formula, but does not appear to save the result, so no change is needed there. Html and Csv save the result but not the formula (for preCalculateFormulas true - they save the formula but not the result for false), so no change is needed for them.
It is not clear what the use case is for oldCalculatedValue, but it does date back to PhpExcel. A possible use case is demonstrated in the new tests - Excel function INFO is not implemented, so getCalculatedValue will generally return null on such a cell, but will return oldCalculatedValue when it sees that the function is not implemented but oldCalculatedValue has been set (typically by loading an existing spreadsheet), so the result that is on the spreadsheet will be available to the program which loaded it.
Reading a spreadsheet which has been created with preCalculateFormulas false will, or at least should, result in a null oldCalculatedValue. This was true for Xls, Xml, and Slk. Xlsx was actually storing 0 in this situation; that wasn't precisely a problem, but it wasn't necessary and seems misleading. Xlsx Writer is changed to no longer set a value in this situation. This is technically a break, but the existing code was wrong; one unit test needed a very minor modification as a result of this change.
oleibman
oleibman