errors: validate input arguments
This makes sure the input arguments get validated so implementation errors will be caught early. It also improves a couple of error messages by providing more detailed information and fixes errors detected by the new functionality. Besides that a error type got simplified and tests got refactored.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines