We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Require minium length for "explanation" field in BCD signals
**Summary**
_What should be changed?_
A minimum length of 10 characters should be required for the "explanation" field in BCD signals

**Rationale**
_What problems would this solve?_
Less spam submissions

**Audience**
_Who would use this changed feature?_
BCD maintainers

**Proposal**
_What would users see and do? What would happen as a result?_
Users would be required to enter a meaningful explanation and hopefully refrain from submitting "fehfs", "test", and other garbage.

**Additional context**
_Is there anything else we should know?_
Was discussed in https://github.com/mdn/sprints/issues/2289

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `kuma/api/v1/serializers.py`
Content:
```
1 from rest_framework import exceptions
2 from rest_framework import serializers
3 
4 from kuma.wiki.models import BCSignal, Document
5 
6 
7 class BCSignalSerializer(serializers.Serializer):
8     feature = serializers.CharField(max_length=255)
9     browsers = serializers.CharField(max_length=255)
10     slug = serializers.CharField(max_length=255)
11     locale = serializers.CharField(max_length=7)
12     explanation = serializers.CharField(allow_blank=True, max_length=1000)
13     supporting_material = serializers.CharField(
14         allow_blank=True, required=False, max_length=1000
15     )
16 
17     def create(self, validated_data):
18         slug = validated_data.pop("slug")
19         locale = validated_data.pop("locale")
20         document = Document.objects.filter(slug=slug, locale=locale).first()
21 
22         if document:
23             return BCSignal.objects.create(document=document, **validated_data)
24         raise exceptions.ValidationError("Document not found")
25
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/kuma/api/v1/serializers.py b/kuma/api/v1/serializers.py
--- a/kuma/api/v1/serializers.py
+++ b/kuma/api/v1/serializers.py
@@ -9,7 +9,11 @@
     browsers = serializers.CharField(max_length=255)
     slug = serializers.CharField(max_length=255)
     locale = serializers.CharField(max_length=7)
-    explanation = serializers.CharField(allow_blank=True, max_length=1000)
+    explanation = serializers.CharField(
+        # Make sure these match the constants in bcd-signal.jsx
+        max_length=1000,
+        min_length=10,
+    )
     supporting_material = serializers.CharField(
         allow_blank=True, required=False, max_length=1000
     )

{"golden_diff": "diff --git a/kuma/api/v1/serializers.py b/kuma/api/v1/serializers.py\n--- a/kuma/api/v1/serializers.py\n+++ b/kuma/api/v1/serializers.py\n@@ -9,7 +9,11 @@\n     browsers = serializers.CharField(max_length=255)\n     slug = serializers.CharField(max_length=255)\n     locale = serializers.CharField(max_length=7)\n-    explanation = serializers.CharField(allow_blank=True, max_length=1000)\n+    explanation = serializers.CharField(\n+        # Make sure these match the constants in bcd-signal.jsx\n+        max_length=1000,\n+        min_length=10,\n+    )\n     supporting_material = serializers.CharField(\n         allow_blank=True, required=False, max_length=1000\n     )\n", "issue": "Require minium length for \"explanation\" field in BCD signals\n**Summary**\r\n_What should be changed?_\r\nA minimum length of 10 characters should be required for the \"explanation\" field in BCD signals\r\n\r\n**Rationale**\r\n_What problems would this solve?_\r\nLess spam submissions\r\n\r\n**Audience**\r\n_Who would use this changed feature?_\r\nBCD maintainers\r\n\r\n**Proposal**\r\n_What would users see and do? What would happen as a result?_\r\nUsers would be required to enter a meaningful explanation and hopefully refrain from submitting \"fehfs\", \"test\", and other garbage.\r\n\r\n**Additional context**\r\n_Is there anything else we should know?_\r\nWas discussed in https://github.com/mdn/sprints/issues/2289\n", "before_files": [{"content": "from rest_framework import exceptions\nfrom rest_framework import serializers\n\nfrom kuma.wiki.models import BCSignal, Document\n\n\nclass BCSignalSerializer(serializers.Serializer):\n    feature = serializers.CharField(max_length=255)\n    browsers = serializers.CharField(max_length=255)\n    slug = serializers.CharField(max_length=255)\n    locale = serializers.CharField(max_length=7)\n    explanation = serializers.CharField(allow_blank=True, max_length=1000)\n    supporting_material = serializers.CharField(\n        allow_blank=True, required=False, max_length=1000\n    )\n\n    def create(self, validated_data):\n        slug = validated_data.pop(\"slug\")\n        locale = validated_data.pop(\"locale\")\n        document = Document.objects.filter(slug=slug, locale=locale).first()\n\n        if document:\n            return BCSignal.objects.create(document=document, **validated_data)\n        raise exceptions.ValidationError(\"Document not found\")\n", "path": "kuma/api/v1/serializers.py"}], "after_files": [{"content": "from rest_framework import exceptions\nfrom rest_framework import serializers\n\nfrom kuma.wiki.models import BCSignal, Document\n\n\nclass BCSignalSerializer(serializers.Serializer):\n    feature = serializers.CharField(max_length=255)\n    browsers = serializers.CharField(max_length=255)\n    slug = serializers.CharField(max_length=255)\n    locale = serializers.CharField(max_length=7)\n    explanation = serializers.CharField(\n        # Make sure these match the constants in bcd-signal.jsx\n        max_length=1000,\n        min_length=10,\n    )\n    supporting_material = serializers.CharField(\n        allow_blank=True, required=False, max_length=1000\n    )\n\n    def create(self, validated_data):\n        slug = validated_data.pop(\"slug\")\n        locale = validated_data.pop(\"locale\")\n        document = Document.objects.filter(slug=slug, locale=locale).first()\n\n        if document:\n            return BCSignal.objects.create(document=document, **validated_data)\n        raise exceptions.ValidationError(\"Document not found\")\n", "path": "kuma/api/v1/serializers.py"}]}