[renatodamas]

Related Issue
Closes #937 (feature request: kebab-case / aliased request parameters).

Proposed Changes
Adds an opt-in Alias marker so handler parameters can read request data under a different name, e.g.:

from typing import Annotated
from fasthtml.common import Alias

@rt("/profile")
def get(user_id: Annotated[str, Alias("userId")]): ...

Changes in nbs/api/00_core.ipynb (source for fasthtml/core.py):
• New Alias dataclass, exported via fasthtml.common.
• find_p unwraps Annotated[T, ...] and uses the alias for path, cookie, query, form, htmx values, and header lookups (headers default to snake2hyphens when no alias is set).
• Missing-field errors report the alias name.
Parameters without Alias behave exactly as before.

Validation: tests/test_alias.py 9/9 pass. Full suite: 13 passed, 1 failed. test_toaster.py::test_get_toaster_with_typehint also fails on main, so it is pre-existing.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist
Go over all the following points, and put an x in all the boxes that apply:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• I am aware that this is an nbdev project, and I have edited, cleaned, and synced the source notebooks instead of editing .py or .md files directly.

[renatodamas]

The commit dfc4ea3 has implemented kebab-case parameter support (issue #937). PR #938 will be revised to focus solely on supporting completely different names for request parameters.