json: fix cycle detection#153

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extemporalgenome wants to merge 10 commits intomasterfrom

kgillette/2025-07/fix-cycle-detection

Commits on Jul 29, 2025

json: consistent use of encodeNull (should inline well)
extemporalgenome
committed

Commits on Nov 27, 2025

json: remove unnecessary bespoke pointer types
extemporalgenome
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json: seen data structure used in codec building supports non-structs
extemporalgenome
committed

Commits on Nov 28, 2025

json: update cycle checking aspects from stdlib golang_encode_test.go
extemporalgenome
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Commits on Nov 30, 2025