jsonify encodes decimal to str

tests/test_json.py

@@ -1,4 +1,5 @@
 import datetime
+import decimal
 import io
 import uuid
 
@@ -187,6 +188,11 @@ def test_jsonify_uuid_types(app, client):
     assert rv_uuid == test_uuid
 
 
+def test_json_decimal():
+    rv = flask.json.dumps(decimal.Decimal("0.003"))
+    assert rv == '"0.003"'
+
+
 def test_json_attr(app, client):
     @app.route("/add", methods=["POST"])
     def add():