[release/7.0] Allow underscores in identifiers again #29822
Merged
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Port of #29821
Fixes #29450
Description
A change in the validation of identifier names resulted in an unintentional breaking change.
Customer impact
If the generated files would contain underscores the customer needs to add them manually to allow them to compile against existing code.
How found
Customer reported on 7.0
Regression
Yes.
Testing
Adjusted the tests for the affected scenario
Risk
Low; the fix reverts the affected code to the 6.0 version.