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TypedPython: exact-type dict[str, int] and str fast path (wordfreq) #150
Description
Approved by the user (2026-10-04). wordfreq is 1.1x: dict and str stay opaque objects. Add a path for exact dict with exact str keys and exact int values that calls the same C API (PyDict_GetItem/SetItem, str methods) directly, so no user hash/eq can run and results equal CPython's; anything not exact takes the existing object path.
Done when: differential tests (including str subclasses and int subclasses falling back), and wordfreq re-measured.
Activity
Feat: Cost rule: object-only impure functions stay interpreted (#150)
Fix: The cost rule rejects only object-only loops; straight-line impu…
Bench: Record why object-only compiled code lost to the interpreter (#…
Merge pull request #253 from thisisthepy/feat/tp-dict-str
b-re-w commentedon Oct 17, 2026
Landed in develop via #253: the operations and exact dict/str fast paths are in, results identical to CPython. The wordfreq speedup is blocked on #232 (object-mode ints lose to CPython 3.15's specialising interpreter); a cost rule prevents the regression meanwhile.