diff --git a/spacy/language.py b/spacy/language.py
index eba54dae2..098b83e5a 100644
--- a/spacy/language.py
+++ b/spacy/language.py
@@ -2222,22 +2222,12 @@ class Language:
 
         DOCS: https://spacy.io/api/language#to_disk
         """
-        def _dump_meta(path) -> None:
-            """Helper function for to_disk. It's not entirely clear why this is
-            necessary: we're seeing numpy.float32 values in the Ukraining trf
-            model meta, maybe it'll happen elsewhere as well -- but it seems
-            to originate from the specific transformer code being used by that
-            model.
-            """
-            meta = convert_recursive(lambda v: isinstance(v, numpy.floating), lambda v: float(v), dict(self.meta))
-            srsly.write_json(path, meta)
-
         path = util.ensure_path(path)
         serializers = {}
         serializers["tokenizer"] = lambda p: self.tokenizer.to_disk(  # type: ignore[union-attr]
             p, exclude=["vocab"]
         )
-        serializers["meta.json"] = _dump_meta
+        serializers["meta.json"] = lambda p: srsly.write_json(p, _replace_numpy_floats(self.meta))
         serializers["config.cfg"] = lambda p: self.config.to_disk(p)
         for name, proc in self._components:
             if name in exclude:
@@ -2345,20 +2335,10 @@ class Language:
 
         DOCS: https://spacy.io/api/language#to_bytes
         """
-        def _dump_meta() -> str:
-            """Helper function for to_disk. It's not entirely clear why this is
-            necessary: we're seeing numpy.float32 values in the Ukraining trf
-            model meta, maybe it'll happen elsewhere as well -- but it seems
-            to originate from the specific transformer code being used by that
-            model.
-            """
-            meta = convert_recursive(lambda v: isinstance(v, numpy.floating), lambda v: float(v), dict(self.meta))
-            return srsly.json_dumps(meta)
-
         serializers: Dict[str, Callable[[], bytes]] = {}
         serializers["vocab"] = lambda: self.vocab.to_bytes(exclude=exclude)
         serializers["tokenizer"] = lambda: self.tokenizer.to_bytes(exclude=["vocab"])  # type: ignore[union-attr]
-        serializers["meta.json"] = _dump_meta  # type: ignore
+        serializers["meta.json"] = lambda: srsly.json_dumps(_replace_numpy_floats(self.meta))
         serializers["config.cfg"] = lambda: self.config.to_bytes()
         for name, proc in self._components:
             if name in exclude:
@@ -2552,4 +2532,14 @@ class _WorkDoneSentinel:
     pass
 
 
+def _replace_numpy_floats(container: dict) -> dict:
+    """Helper function for to_disk. It's not entirely clear why this is
+    necessary: we're seeing numpy.float32 values in the Ukraining trf
+    model meta, maybe it'll happen elsewhere as well -- but it seems
+    to originate from the specific transformer code being used by that
+    model.
+    """
+    return convert_recursive(lambda v: isinstance(v, numpy.floating), lambda v: float(v), container)
+
+
 _WORK_DONE_SENTINEL = _WorkDoneSentinel()