[Question] About migration for 9.11.X to 9.16.X.

[Techs-yama]

Hi BIND users all.

I'm thinking about BIND Version migration for 9.11.X to 9.16.X.
Also,  I'm about to check the different default config value and config
parameters for the purpose of that now.

I would like to ask you all.
Are there any other points of observe carefully when migrating versions?
  e.g.)Behaves differently, Added 9.16.X only new features, etc.
also, Is there any documentation that might be helpful?

Best regards.
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