khepri_machine: Use functions to manipulate the internal state #253
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… instead of using the record directly.
Why
This is a preparation step for a future update of the record. At that point, there will be two versions of the state record to support and it's easier to isolate that handling in a few functions.
How
All reads and writes to the state go through a set of
get_*/1
andset_*/2
functions.