Document Private State Quirks

[bflad]

Does this documenation exist?

• This is new documentation
• This is an enhancement to existing documentation

Where would you expect to find this documentation?

• On terraform.io
• In the GoDoc for this module
• In this repo as a markdown file
• Somewhere else

Details

• Private state must be preserved (if desired) between requests and responses, or its lost
• Private state from the PlanResourceChange RPC is what is sent to the ApplyResourceChange RPC (this may be fairly obvious, but it'd be good to document it explicitly)

[github-actions]

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