prevent additional properties #139
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For strict validation (eg validation services), it makes sense to be able to prevent additional properties. This MR provides this feature.
Open question: it might make sense to enable prevent additional attributes via env or something else, too, to make a strict validation in tests and therefore find inconsistencies. One could just take
os.envfor that. Do you think this is a good idea? And if yes, how should we call the env var? justVALIDATACLASS_PREVENT_ADDITIONAL_ATTRIBUTES?