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A class redefinition is to take a migration hook written from the live session

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Joseph Ferano 2026-09-25 10:08:22 +07:00
parent 763c835496
commit 9cc820cb52
1 changed files with 2 additions and 1 deletions
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@ -524,7 +524,8 @@ dispatch values. With single dispatch on literal values there is no specificity
question, and inheritance or multiple dispatch would create one. Unknown-slot
checking needs class-typed tracking the dyn side deliberately does not have.
** TODO update-instance-for-redefined-class, the user hook
** NEXT update-instance-for-redefined-class, the user hook
Decided 2026-09-25: build it after typed class slots land, shaped for the REPL — written and installed from a live session as a one-time "here is how to migrate this", without restarting. It receives the instance with the added and discarded slots and their old values, and runs at each instance's lazy migration. A hook that signals parks in the break buffer with a restart that falls back to name-matching migration.
Left out of v1 because name matching is the half that makes redefinition usable
and the hook is what makes it expressive. The obvious spelling is a generic riding
the dispatch that exists, and the migration already computes both the added and