restore the extract function for server functions (#4849)

* restore the extract function for server functions

* fix compilation

* Move most fields under one shared lock

* fix typo

* fix clippy

* restore somewhat misleading FromRequest bound

* remove unused import

* fix doc links

packages/fullstack/src/payloads/cbor.rs

@@ -21,7 +21,7 @@ use serde::{de::DeserializeOwned, Serialize};
 /// *last* if there are multiple extractors in a handler.
 /// See ["the order of extractors"][order-of-extractors]
 ///
-/// [order-of-extractors]: crate::extract#the-order-of-extractors
+/// [order-of-extractors]: mod@crate::extract#the-order-of-extractors
 #[must_use]
 pub struct Cbor<T>(pub T);
 

packages/fullstack/src/payloads/multipart.rs

@@ -32,7 +32,7 @@ use axum::extract::multipart::{Field, MultipartError};
 /// `Multipart` extractor must be *last* if there are multiple extractors in a handler.
 /// See ["the order of extractors"][order-of-extractors]
 ///
-/// [order-of-extractors]: crate::extract#the-order-of-extractors
+/// [order-of-extractors]: mod@crate::extract#the-order-of-extractors
 ///
 /// # Large Files
 ///

packages/fullstack/src/payloads/postcard.rs

@@ -23,7 +23,7 @@ use std::future::Future;
 /// *last* if there are multiple extractors in a handler.
 /// See ["the order of extractors"][order-of-extractors]
 ///
-/// [order-of-extractors]: crate::extract#the-order-of-extractors
+/// [order-of-extractors]: mod@crate::extract#the-order-of-extractors
 pub struct Postcard<T>(pub T);
 
 #[derive(thiserror::Error, Debug)]