diff --git a/rust/Cargo.toml b/rust/Cargo.toml
index 928e7bd..a27190f 100644
--- a/rust/Cargo.toml
+++ b/rust/Cargo.toml
@@ -12,5 +12,5 @@ chainfile = "0.2.1"
 directories = "5.0"
 
 [dependencies.pyo3]
-version = "0.20.0"
+version = "0.20.2"
 features = ["abi3-py38"]
diff --git a/src/chainlifter/lifter.py b/src/chainlifter/lifter.py
index c7a52aa..db4dffa 100644
--- a/src/chainlifter/lifter.py
+++ b/src/chainlifter/lifter.py
@@ -2,7 +2,7 @@
 import logging
 from enum import Enum
 from pathlib import Path
-from typing import Callable, List
+from typing import Callable, List, Tuple
 
 from wags_tails import CustomData
 from wags_tails.utils.downloads import download_http, handle_gzip
@@ -93,7 +93,7 @@ def _download_data(version: str, file: Path) -> None:
 
     def convert_coordinate(
         self, chrom: str, pos: int, strand: Strand = Strand.POSITIVE
-    ) -> List[List[str]]:
+    ) -> List[Tuple[str, int, Strand]]:
         """Perform liftover for given params
 
         The ``Strand`` enum provides constraints for legal strand values:
@@ -113,9 +113,9 @@ def convert_coordinate(
         :return: list of coordinate matches (possibly empty)
         """
         try:
-            result = self._chainlifter.lift(chrom, pos, strand)
+            results = self._chainlifter.lift(chrom, pos, strand)
         except _core.NoLiftoverError:
-            result = []
+            results = []
         except _core.ChainfileError:
             _logger.error(
                 "Encountered internal error while converting coordinates - is the chainfile invalid? (%s, %s, %s)",
@@ -123,5 +123,18 @@ def convert_coordinate(
                 pos,
                 strand,
             )
-            result = []
-        return result
+            results = []
+        formatted_results: List[Tuple[str, int, Strand]] = []
+        for result in results:
+            try:
+                pos = int(result[1])
+            except ValueError:
+                _logger.error("Got invalid position value in %s", result)
+                continue
+            try:
+                strand = Strand(result[2])
+            except ValueError:
+                _logger.error("Got invalid Strand value in %s", result)
+                continue
+            formatted_results.append((result[0], pos, strand))
+        return formatted_results
diff --git a/tests/test_liftover.py b/tests/test_liftover.py
index fce8b8f..1e3dc8c 100644
--- a/tests/test_liftover.py
+++ b/tests/test_liftover.py
@@ -1,5 +1,5 @@
 """Run liftover tests."""
-from chainlifter.lifter import ChainLifter, Genome
+from chainlifter.lifter import ChainLifter, Genome, Strand
 
 
 def test_hg19_to_hg38():
@@ -8,19 +8,19 @@ def test_hg19_to_hg38():
 
     result = ch.convert_coordinate("chr7", 140439611)
     assert len(result) == 1
-    assert result[0] == ["chr7", "140739811", "+"]
+    assert result[0] == ("chr7", 140739811, Strand.POSITIVE)
 
     result = ch.convert_coordinate("chr7", 140439746)
     assert len(result) == 1
-    assert result[0] == ["chr7", "140739946", "+"]
+    assert result[0] == ("chr7", 140739946, Strand.POSITIVE)
 
     result = ch.convert_coordinate("chr7", 140439703)
     assert len(result) == 1
-    assert result[0] == ["chr7", "140739903", "+"]
+    assert result[0] == ("chr7", 140739903, Strand.POSITIVE)
 
     result = ch.convert_coordinate("chr7", 140453136)
     assert len(result) == 1
-    assert result[0] == ["chr7", "140753336", "+"]
+    assert result[0] == ("chr7", 140753336, Strand.POSITIVE)
 
     # coordinate exceeds bounds
     result = ch.convert_coordinate("chr7", 14040053136)
@@ -28,17 +28,17 @@ def test_hg19_to_hg38():
 
 
 def test_hg38_to_hg19():
-    """Test hg38 to hg19 lifter."""
+    "Test hg38 to hg19 lifter." ""
     ch = ChainLifter(Genome.HG38, Genome.HG19)
 
     result = ch.convert_coordinate("chr7", 140739811)
     assert len(result) == 1
-    assert result[0] == ["chr7", "140439611", "+"]
+    assert result[0] == ("chr7", 140439611, Strand.POSITIVE)
 
     result = ch.convert_coordinate("chr7", 140759820)
     assert len(result) == 1
-    assert result[0] == ["chr7", "140459620", "+"]
+    assert result[0] == ("chr7", 140459620, Strand.POSITIVE)
 
     result = ch.convert_coordinate("chr7", 60878240)
     assert len(result) == 1
-    assert result[0] == ["chr7", "61646115", "+"]
+    assert result[0] == ("chr7", 61646115, Strand.POSITIVE)