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Reviewing files that changed from the base of the PR and between 476b75d and 73ad0f4.

• crates/stdlib/src/contextvars.rs
• crates/stdlib/src/sqlite.rs
• crates/vm/src/protocol/mapping.rs
• crates/vm/src/protocol/sequence.rs
• crates/vm/src/types/slot.rs

crates/stdlib/src/contextvars.rs (1)

267-267: LGTM!

The change from AtomicCell::new(None) to plain None correctly aligns with the updated PyMappingMethods struct definition where fields are now plain Option types instead of AtomicCell-wrapped options.

crates/stdlib/src/sqlite.rs (1)

2548-2567: LGTM!

The AsSequence implementation for Blob correctly updates the unimplemented sequence method slots from AtomicCell::new(None) to plain None, consistent with the new PySequenceMethods struct definition. The contains slot appropriately uses atomic_func! for its actual implementation.

crates/vm/src/types/slot.rs (4)

114-118: LGTM!

The atomic_func! macro now returns Some($x) directly instead of wrapping in AtomicCell. This aligns with the migration from AtomicCell-wrapped function pointers to plain Option types in PyMappingMethods and PySequenceMethods.

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388-439: LGTM!

Clean extraction of sequence/mapping operation wrappers into dedicated named functions. The #[inline(never)] annotations prevent these wrappers from being inlined, which helps with code size and debuggability. Each wrapper correctly delegates to the underlying generic len_wrapper, getitem_wrapper, setitem_wrapper, or contains_wrapper functions.

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1194-1240: LGTM!

The slot accessor updates correctly reference the new named wrapper functions (sequence_len_wrapper, sequence_getitem_wrapper, sequence_setitem_wrapper, sequence_contains_wrapper, mapping_len_wrapper, mapping_getitem_wrapper, mapping_setitem_wrapper) instead of inline closures.

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1564-1617: LGTM!

The addition of explicit dunder methods (__eq__, __ne__, __lt__, __le__, __ge__, __gt__) to the Comparable trait provides proper Python-level method exposure. Each method correctly delegates to Self::cmp with the appropriate PyComparisonOp variant, maintaining consistency with the slot-level slot_richcompare implementation.

crates/vm/src/protocol/mapping.rs (2)

37-47: LGTM!

The copy_from method correctly accesses the PyMappingMethods fields directly (no longer using .load()) since they are now plain Option types. The pattern if let Some(f) = methods.field cleanly handles the optional function pointers.

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52-70: LGTM!

The PyMappingMethods struct now uses plain Option types for its function pointer fields, enabling const initialization of NOT_IMPLEMENTED. The separation between mutable PyMappingSlots (which retains AtomicCell for runtime slot updates) and static PyMappingMethods (now with plain Option for const definitions) is a clean architectural pattern.

crates/vm/src/protocol/sequence.rs (2)

44-69: LGTM!

The copy_from method correctly accesses the PySequenceMethods fields directly since they are now plain Option types. The implementation mirrors the pattern used in PyMappingSlots::copy_from.

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72-103: LGTM!

The PySequenceMethods struct now uses plain Option types for all function pointer fields, enabling const initialization of NOT_IMPLEMENTED. This change is consistent with the PyMappingMethods refactoring and maintains the clean separation between mutable PySequenceSlots (retaining AtomicCell) and static PySequenceMethods (now with plain Option).