Add minimal reproduction for form field metadata bug

test_issue_13471/fastapi

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+Subproject commit 27f4240750eb5598aea4bc792c425efcd74a7393

test_issue_13471/form_dependency_test.py

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+from fastapi import FastAPI, Form, Depends
+from pydantic import BaseModel
+from fastapi.responses import JSONResponse
+
+app = FastAPI()
+
+class User(BaseModel):
+    name: str
+    age: int
+
+def get_user(
+    name: str = Form(..., description="The user's name"),
+    age: int = Form(..., description="The user's age")
+) -> User:
+    return User(name=name, age=age)
+
+@app.post("/submit")
+def submit(user: User = Depends(get_user)):
+    return JSONResponse(content={"name": user.name, "age": user.age})

test_issue_13471/form_metadata_repro.py

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+from fastapi import FastAPI, Form, Depends
+from pydantic import BaseModel
+from fastapi.responses import JSONResponse
+
+app = FastAPI()
+
+class User(BaseModel):
+    name: str
+    age: int
+
+def get_user(
+    name: str = Form(..., description="The user's name"),
+    age: int = Form(..., description="The user's age")
+) -> User:
+    return User(name=name, age=age)
+
+@app.post("/submit")
+def submit(user: User = Depends(get_user)):
+    return JSONResponse(content={"name": user.name, "age": user.age})