diff --git a/spacy/pipeline/span_finder.py b/spacy/pipeline/span_finder.py
index d767c6e18..3e44b8d01 100644
--- a/spacy/pipeline/span_finder.py
+++ b/spacy/pipeline/span_finder.py
@@ -117,20 +117,6 @@ def span_finder_score(examples: Iterable[Example], **kwargs) -> Dict[str, Any]:
     return scores
 
 
-class _MaxInt(int):
-    def __le__(self, other):
-        return False
-
-    def __lt__(self, other):
-        return False
-
-    def __ge__(self, other):
-        return True
-
-    def __gt__(self, other):
-        return True
-
-
 def _char_indices(span: Span) -> Tuple[int, int]:
     start = span[0].idx
     end = span[-1].idx + len(span[-1])
@@ -163,25 +149,24 @@ class SpanFinder(TrainablePipe):
             initialization and training, the component will look for spans on the
             reference document under the same key.
         max_length (Optional[int]): Max length of the produced spans, defaults to None meaning unlimited length.
-        min_length (Optional[int]): Min length of the produced spans, defaults to None meaining shortest span is length 1.
+        min_length (Optional[int]): Min length of the produced spans, defaults to None meaning shortest span is length 1.
         """
         self.vocab = nlp.vocab
-        self.threshold = threshold
-        if max_length is None:
-            max_length = _MaxInt()
-        if min_length is None:
-            min_length = 1
-        if max_length < 1 or min_length < 1:
+        if (max_length is not None and max_length < 1) or (
+            min_length is not None and min_length < 1
+        ):
             raise ValueError(
                 Errors.E1053.format(min_length=min_length, max_length=max_length)
             )
-        self.min_length = min_length
-        self.max_length = max_length
-        self.spans_key = spans_key
         self.model = model
         self.name = name
         self.scorer = scorer
-        self.cfg = {"spans_key": spans_key}
+        self.cfg: Dict[str, Any] = {
+            "min_length": min_length,
+            "max_length": max_length,
+            "threshold": threshold,
+            "spans_key": spans_key,
+        }
 
     def predict(self, docs: Iterable[Doc]):
         """Apply the pipeline's model to a batch of docs, without modifying them.
@@ -198,24 +183,31 @@ class SpanFinder(TrainablePipe):
         """
         offset = 0
         for i, doc in enumerate(docs):
-            doc.spans[self.spans_key] = []
+            doc.spans[self.cfg["spans_key"]] = []
             starts = []
             ends = []
             doc_scores = scores[offset : offset + len(doc)]
 
             for token, token_score in zip(doc, doc_scores):
-                if token_score[0] >= self.threshold:
+                if token_score[0] >= self.cfg["threshold"]:
                     starts.append(token.i)
-                if token_score[1] >= self.threshold:
+                if token_score[1] >= self.cfg["threshold"]:
                     ends.append(token.i)
 
+            print(self.cfg)
             for start in starts:
                 for end in ends:
                     span_length = end + 1 - start
-                    if span_length > self.max_length:
-                        break
-                    elif self.min_length <= span_length:
-                        doc.spans[self.spans_key].append(doc[start : end + 1])
+                    if span_length < 1:
+                        continue
+                    if (
+                        self.cfg["min_length"] is None
+                        or self.cfg["min_length"] <= span_length
+                    ) and (
+                        self.cfg["max_length"] is None
+                        or span_length <= self.cfg["max_length"]
+                    ):
+                        doc.spans[self.cfg["spans_key"]].append(doc[start : end + 1])
             offset += len(doc)
 
     def update(
@@ -271,8 +263,8 @@ class SpanFinder(TrainablePipe):
             n_tokens = len(eg.predicted)
             truth = ops.xp.zeros((n_tokens, 2), dtype="float32")
             mask = ops.xp.ones((n_tokens, 2), dtype="float32")
-            if self.spans_key in eg.reference.spans:
-                for span in eg.reference.spans[self.spans_key]:
+            if self.cfg["spans_key"] in eg.reference.spans:
+                for span in eg.reference.spans[self.cfg["spans_key"]]:
                     ref_start_char, ref_end_char = _char_indices(span)
                     pred_span = eg.predicted.char_span(
                         ref_start_char, ref_end_char, alignment_mode="expand"
diff --git a/spacy/tests/pipeline/test_span_finder.py b/spacy/tests/pipeline/test_span_finder.py
index 9c6b6c3e0..91b08cabf 100644
--- a/spacy/tests/pipeline/test_span_finder.py
+++ b/spacy/tests/pipeline/test_span_finder.py
@@ -209,7 +209,7 @@ def test_overfitting_IO():
     # test the trained model
     test_text = "I like London and Berlin"
     doc = nlp(test_text)
-    spans = doc.spans[span_finder.spans_key]
+    spans = doc.spans[SPANS_KEY]
     assert len(spans) == 3
     assert set([span.text for span in spans]) == {
         "London",
@@ -222,7 +222,7 @@ def test_overfitting_IO():
         nlp.to_disk(tmp_dir)
         nlp2 = util.load_model_from_path(tmp_dir)
         doc2 = nlp2(test_text)
-        spans2 = doc2.spans[span_finder.spans_key]
+        spans2 = doc2.spans[SPANS_KEY]
         assert len(spans2) == 3
         assert set([span.text for span in spans2]) == {
             "London",
@@ -232,11 +232,11 @@ def test_overfitting_IO():
 
     # Test scoring
     scores = nlp.evaluate(train_examples)
-    assert f"span_finder_{span_finder.spans_key}_f" in scores
+    assert f"span_finder_{SPANS_KEY}_f" in scores
     # It's not perfect 1.0 F1 because it's designed to overgenerate for now.
-    assert scores[f"span_finder_{span_finder.spans_key}_p"] == 0.75
-    assert scores[f"span_finder_{span_finder.spans_key}_r"] == 1.0
+    assert scores[f"span_finder_{SPANS_KEY}_p"] == 0.75
+    assert scores[f"span_finder_{SPANS_KEY}_r"] == 1.0
 
     # also test that the spancat works for just a single entity in a sentence
     doc = nlp("London")
-    assert len(doc.spans[span_finder.spans_key]) == 1
+    assert len(doc.spans[SPANS_KEY]) == 1