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[3.15] gh-155315: Fix marshal round-trip of shared frozendict references (GH-155316) - #155945

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[3.15] gh-155315: Fix marshal round-trip of shared frozendict references (GH-155316)#155945
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@miss-islington miss-islington commented Aug 17, 2026

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The TYPE_FROZENDICT reader reserved a reference slot but never filled it with
r_ref_insert, unlike TYPE_FROZENSET, so a frozendict referenced more than once
failed to load with ValueError.
(cherry picked from commit b6c11fe)

Co-authored-by: tonghuaroot (童话) [email protected]

…es (pythonGH-155316)

The TYPE_FROZENDICT reader reserved a reference slot but never filled it with
r_ref_insert, unlike TYPE_FROZENSET, so a frozendict referenced more than once
failed to load with ValueError.
(cherry picked from commit b6c11fe)

Co-authored-by: tonghuaroot (童话) <[email protected]>
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