diff --git a/.github/workflows/buildwheel.yml b/.github/workflows/buildwheel.yml
@@ -19,7 +19,7 @@ jobs:
         with:
           python-version: '3.13'
 
-      - uses: msys2/setup-msys2@v2
+      - uses: msys2/setup-msys2@v2.27.0
         with:
           msystem: mingw64
           # path-type inherit is used so that when cibuildwheel calls msys2 to

diff --git a/README.md b/README.md
@@ -164,10 +164,14 @@ Next release (0.8.0)...
 
 Contributors
 
+- Oscar Benjamin (OB)
 - Robert Dougherty-Bliss (RDB)
 
 Changes
 
+- [gh-289](https://github.com/flintlib/python-flint/pull/289),
+  Add `.prec` attribute to series types `fmpz_series`, `fmpq_series`,
+  `arb_series` and `acb_series`. (OB)
 - [gh-274](https://github.com/flintlib/python-flint/pull/274),
   Add resultant methods to `fmpz_poly`, `fmpq_poly` and
   `nmod_poly`. Now all univariate and polynomial types have the

diff --git a/src/flint/test/test_all.py b/src/flint/test/test_all.py
@@ -666,7 +666,11 @@ def test_fmpz_series():
     s2 = Z([1,2])
     s3 = Z([1,1])
     s4 = Z([1,2],11)
+    s5 = Z([1,2],3)
     p1 = Zp([1,2])
+    assert s1.prec == 10
+    assert s4.prec == 11
+    assert s5.prec == 3
     assert s1._equal_repr(s1) is True
     assert s1._equal_repr(s2) is True
     assert s1._equal_repr(s3) is False
@@ -1157,10 +1161,14 @@ def test_fmpq_series():
     s2 = Q([1,2])
     s3 = Q([1,1])
     s4 = Q([1,2],1,11)
+    s5 = Q([1,2],1,3)
     p1 = Qp([1,2])
     sz1 = Z([1,2])
     sz2 = Z([1,1])
     sz3 = Z([1,1],11)
+    assert s1.prec == 10
+    assert s4.prec == 11
+    assert s5.prec == 3
     assert s1._equal_repr(s1) is True
     assert s1._equal_repr(s2) is True
     assert s1._equal_repr(s3) is False

diff --git a/src/flint/test/test_docstrings.py b/src/flint/test/test_docstrings.py
@@ -5,34 +5,48 @@
 
 import flint
 
-dunder_test_regex = re.compile(r'^(.*?)__test__\.(.*?\.)(.*) \(line (\d+)\)$')
+dunder_test_regex = re.compile(r'^(.*?)__test__\.(.*?) \(line (\d+)\)$')
 
 test_flint_at_least = {
     "flint.types._gr.gr_ctx.gens": 30100,
     "flint.types._gr.gr_ctx.neg": 30100,
+    "flint.types.acb_theta.acb_theta": 30300,
 }
 
 
 def find_doctests(module):
     finder = doctest.DocTestFinder()
     tests = []
+    tests_seen = set()
     for module_info in pkgutil.walk_packages(module.__path__, flint.__name__ + "."):
         try:
             module = importlib.import_module(module_info.name)
 
             res = []
             for test in filter(lambda x: bool(x.examples), finder.find(module)):
+
                 m = dunder_test_regex.match(test.name)
                 if m is not None:
                     groups = m.groups()
-                    test.name = groups[0] + groups[2]
-                    test.lineno = int(groups[3])
-
-                    if (
-                        test_flint_at_least.get("".join(groups[:3]), flint.__FLINT_RELEASE__)
-                        <= flint.__FLINT_RELEASE__
-                    ):
-                        res.append(test)
+                    test.name = groups[0] + groups[1]
+                    test.lineno = int(groups[2])
+
+                    # Prefer the __test__ version of the test (remove the other)
+                    if test.name in tests_seen:
+                        n = len(res)
+                        res = [r for r in res if r.name != test.name]
+                        if len(res) != n - 1:
+                            raise Exception(f"Duplicate test name: {test.name}")
+                        tests_seen.remove(test.name)
+
+                # Doctests that fail without latest flint
+                if test.name in test_flint_at_least:
+                    if test_flint_at_least[test.name] > flint.__FLINT_RELEASE__:
+                        continue
+
+                if test.name not in tests_seen:
+                    tests_seen.add(test.name)
+                    res.append(test)
 
             tests.append((module_info.name, res))
 

diff --git a/src/flint/types/acb_series.pxd b/src/flint/types/acb_series.pxd
@@ -4,6 +4,6 @@ from flint.flintlib.functions.acb_poly cimport acb_poly_t
 
 cdef class acb_series(flint_series):
     cdef acb_poly_t val
-    cdef long prec
+    cdef long _prec
     cpdef long length(self)
     cpdef valuation(self)