Rapid security iOS update in Apple API JSON changes reliability

We are reading from an Apple API - https://gdmf.apple.com/v2/pmv that we got from: https://developer.apple.com/business/documentation/MDM-Protocol-Reference.pdf

With rapid security updates coming in, We can see the 16.4.1 (a) update out via Settings > Software Update.

It appears the Apple’s API response has recently been updated with an additional parameter called “ProductVersionExtra” as shown below.

Can someone from Apple please validate that these changes are reliable so we can update the JSON parsing logic at our end?

I'm interested to know the answer to this too, as well as what the purpose of the PrerequisiteBuild field is. Does that mean the OS needs to be on that build before it can be updated to the rapid security response in question?

Rapid security iOS update in Apple API JSON changes reliability
 
 
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