Use runtime type checker typeguard to validate types #6640
Description
Description
We have PEP 484 type annotations pretty much throughout the codebase nowadays. However, sometimes the annotated type does not reflect reality (accurately). Libraries such as typeguard allow to check the type at runtime.
Since this comes with runtime overhead this is not meant to be used in production. However, it is certainly useful in testing, but might also be worth adding as a flag so it can be enabled on development systems at runtime.
Additional context
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