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SCORU/Node: better abstraction for node context mutable fields

Antonio Locasciorequested to merge
nomadic-labs/tezos:alocascio@node_ctxt_reference_abstraction into master

Context

Closes #4909 (closed)

This MR introduces a Reference module to abstract OCaml references, while carrying type-level information about whether they can be mutated or not. This module is used for the mutable fields of the Node context t type. See #4909 (closed).

Manually testing the MR

Checklist

  • Document the interface of any function added or modified (see the coding guidelines)
  • Document any change to the user interface, including configuration parameters (see node configuration)
  • Provide automatic testing (see the testing guide).
  • For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
  • Select suitable reviewers using the Reviewers field below.
  • Select as Assignee the next person who should take action on that MR

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