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Owen Leibman
826451937e
Continuing work started with PR #4016, PR #4026, and PR #4060. 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. After this PR, 231 changes remain, all in src/Calculation.