Exception should be thrown if there are unknown external properties and its corresponding @ConfigurationProperties has attributes 'ignoreUnknownFields' as false and 'ignoreInvalidFields' as true
Fixes gh-22308
Comment From: pivotal-issuemaster
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Comment From: wilkinsona
Thanks for the PR, @YangfanCheng1. The CLA requires the changes that you're submitting to be your original work. Unfortunately, that's not the case as you copy-pasted some of the changes from my issue comment. Thanks anyway but we'll have to close this one.