validate inputs and provide helpful error messages

How to

• Use Annotated[..., Param(...)] to add constraints to scalars and collections.
• Use structured types for body validation; invalid input returns 422 with detail.

Example

from typing import Annotated
from lihil import Route, Param

search = Route("/search")

@search.get
async def find(limit: Annotated[int, Param(ge=1, le=100)], q: str) -> dict:
    return {"limit": limit, "q": q}

References

• http/endpoint.md:1
• http/request/*:1
• http/error-handling.md:1