Refactor to allow adding new field into cache key and/or content #751
+93
−41
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Previously the token cache was based on an internal schema. Over the years, we have hardly changed the token's value to store new fields, and we never changed the token's key format for fear of potential token cache miss.
This PR refactors the token cache implementation. After this PR, future addition of new fields will be as simple as two steps:
This PR is a pure refactoring which does NOT actually change the token key behavior.