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oleibman
64f354eb6e
Improve documentation within program by making explicit what types of values are allowed for variables described as "mixed". In order to avoid broken functionality, this is done mainly through doc-blocks. This will get us closer to Phpstan Level 9, but many changes will be needed before we can consider that. Executable code change is to add 2 new methods to Cell - `getValueString` and `getCalculatedValueString`, which are the same as the methods without the String suffix, except that they always return a string result. These are invoked at several places in the code where it makes sense, in particular by Writer code.