Bump version to 3.10.0 (#788)

Author: igerber

CHANGELOG.md

@@ -5,7 +5,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [3.10.0] - 2026-08-22
 
 ### Added
 - **LPDiD non-absorbing SEs now anchored against the authors' Stata `lpdid` package
@@ -5347,6 +5347,7 @@ for the full feature history leading to this release.
 [2.1.2]: https://github.com/igerber/diff-diff/compare/v2.1.1...v2.1.2
 [2.1.1]: https://github.com/igerber/diff-diff/compare/v2.1.0...v2.1.1
 [2.1.0]: https://github.com/igerber/diff-diff/compare/v2.0.3...v2.1.0
+[3.10.0]: https://github.com/igerber/diff-diff/compare/v3.9.1...v3.10.0
 [3.9.1]: https://github.com/igerber/diff-diff/compare/v3.9.0...v3.9.1
 [3.9.0]: https://github.com/igerber/diff-diff/compare/v3.8.0...v3.9.0
 [3.8.0]: https://github.com/igerber/diff-diff/compare/v3.7.0...v3.8.0

CITATION.cff

@@ -7,8 +7,8 @@ authors:
     family-names: Gerber
     orcid: "https://orcid.org/0009-0009-3275-5591"
 license: MIT
-version: "3.9.1"
-date-released: "2026-08-17"
+version: "3.10.0"
+date-released: "2026-08-22"
 doi: "10.5281/zenodo.19646175"
 url: "https://github.com/igerber/diff-diff"
 repository-code: "https://github.com/igerber/diff-diff"

diff_diff/__init__.py

@@ -368,7 +368,7 @@ def __getattr__(name: str) -> _Any:
     raise AttributeError(f"module 'diff_diff' has no attribute {name!r}")
 
 
-__version__ = "3.9.1"
+__version__ = "3.10.0"
 __all__ = [
     # Estimators
     "DifferenceInDifferences",

diff_diff/guides/llms-full.txt

@@ -2,7 +2,7 @@
 
 > A Python library for Difference-in-Differences causal inference analysis. Provides sklearn-like estimators with statsmodels-style output for econometric analysis.
 
-- Version: 3.9.1
+- Version: 3.10.0
 - Repository: https://github.com/igerber/diff-diff
 - License: MIT
 - Dependencies: numpy, pandas, scipy (no statsmodels dependency)

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "maturin"
 
 [project]
 name = "diff-diff"
-version = "3.9.1"
+version = "3.10.0"
 description = "Difference-in-Differences causal inference with sklearn-like API. Callaway-Sant'Anna, Synthetic DiD, Honest DiD, event studies, parallel trends."
 readme = "README.md"
 license = "MIT"

rust/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "diff_diff_rust"
-version = "3.9.1"
+version = "3.10.0"
 edition = "2021"
 rust-version = "1.85"
 description = "Rust backend for diff-diff DiD library"

tests/test_naming_guard.py

@@ -100,10 +100,14 @@
 # test_ship_version_map_matches_table).
 _SHIP_VERSION = {2: "3.9", 3: "3.9", 4: "3.9", 5: "4.0", 6: "4.1"}
 
-# Release ladder (v4-design section 2): maps the CURRENT (major, minor) to the
-# NEXT release. Keyed off diff_diff.__version__ so the Duty C lifecycle gate
-# re-arms mechanically at each version bump; a missing key fails loudly.
-_NEXT_RELEASE = {(3, 8): "3.9", (3, 9): "4.0", (4, 0): "4.1"}
+# Enforcement horizon (v4-design section 2 release ladder): maps the CURRENT
+# (major, minor) to the version whose deprecation windows must already be
+# enforced — NOT necessarily the literal next release (interim minors like
+# 3.10 keep the 4.0 horizon; "fixing" an entry to a nearer version would
+# silently disarm 4.0-window checks). Keyed off diff_diff.__version__ so the
+# Duty C lifecycle gate re-arms mechanically at each version bump; a missing
+# key fails loudly.
+_NEXT_RELEASE = {(3, 8): "3.9", (3, 9): "4.0", (3, 10): "4.0", (4, 0): "4.1"}
 
 # Section-8 vocabulary predicate (Duty A). Every param/field rename token in
 # the ledger - current and lifecycle-gated - must be matched here
@@ -1542,6 +1546,8 @@ def test_lifecycle_gate_windows_and_loud_keyerror():
     assert _version_tuple("4.0") > horizon_38, "4.0-window rows defer at 3.8.x"
     horizon_39 = _version_tuple(_NEXT_RELEASE[(3, 9)])
     assert _version_tuple("4.0") <= horizon_39, "4.0-window rows arm at the 3.9 bump"
+    horizon_310 = _version_tuple(_NEXT_RELEASE[(3, 10)])
+    assert _version_tuple("4.0") <= horizon_310, "4.0-window rows stay armed at 3.10.x"
     assert (99, 99) not in _NEXT_RELEASE, "unknown versions must fail the gate loudly"
     current = _version_tuple(diff_diff.__version__)[:2]
     assert current in _NEXT_RELEASE, f"extend _NEXT_RELEASE for __version__ {diff_diff.__version__}"