While we might never be able to have 100% of our code strict, we can at
the very least do it for all of our tests. This ensures that our tests
are using our API with the types as intended by the test author, and not
silently be cast to what our API requires.
Fix#3495. This seems to be a bug in Excel, one which it manages to cover up but PhpSpreadsheet is affected. User enters a formula preceded by an apostrophe into a cell. Excel turns on `quotePrefix` style and stores the data as a string rather than a formula. User now enters a formula not preceded by an apostrophe into the same cell. Excel stores it is a formula but does not turn `quotePrefix` off. When the spreadsheet is saved, the cell's style specifies `quotePrefix`, but the cell's content indicates it's a formula. Till now, PhpSpreadsheet sees that quotePrefix is set, and therefore treats the cell's contents as a string rather than a formula. This PR will change that behavior so that quotePrefix is automatically turned off when Xlsx Reader sees that the cell indicates that it is a formula.
Adrien Crivelli
oleibman
anhoder