Better Definitions for Mixed Parameters and Values Part 3 of Many #4060
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Continuing work started with PR #4016 and PR #4026. 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.
This change has more executable code changes than its predecessor. I will wait longer than normal before merging it to allow for additional testing.
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