Run MyPy against n - 1-4 NumPy versions

Author: Mauko Quiroga

.circleci/config.yml

@@ -33,6 +33,10 @@ jobs:
           name: Run Core tests
           command: env PYTEST_ADDOPTS="--exitfirst" make test
 
+      - run:
+          name: Check NumPy typing against latest 3 minor versions
+          command: for i in {1..3}; do VERSION=$(.circleci/get-numpy-version.py prev) && pip install numpy==$VERSION && make check-types; done
+
       - persist_to_workspace:
           root: .
           paths:

.circleci/get-numpy-version.py

@@ -0,0 +1,25 @@
+#! /usr/bin/env python
+
+import sys
+from packaging import version
+
+import numpy
+
+
+def prev() -> str:
+    major, minor, _ = _installed().release
+
+    if minor == 0:
+        exit(1)
+
+    minor -= 1
+    print(f"{major}.{minor}.0")
+    exit()
+
+
+def _installed() -> version:
+    return version.parse(numpy.__version__)
+
+
+if __name__ == "__main__":
+    globals()[sys.argv[1]]()