Revert Dig's merge fixed to bring back const

This reverts commit 44a3dc6e45.

Cargo.lock

@@ -1072,7 +1072,7 @@ dependencies = [
 
 [[package]]
 name = "iroh-quinn"
-version = "0.14.0"
+version = "0.13.0"
 dependencies = [
  "anyhow",
  "async-executor",

docs/book/Cargo.toml

@@ -11,6 +11,6 @@ categories.workspace = true
 [dependencies]
 anyhow.workspace = true
 bytes = { workspace = true }
-quinn = { version = "0.14", path = "../../quinn", package = "iroh-quinn" }
+quinn = { version = "0.13", path = "../../quinn", package = "iroh-quinn" }
 rcgen.workspace = true
 rustls.workspace = true

quinn/src/connection.rs

@@ -1467,3 +1467,10 @@ pub enum SendDatagramError {
 /// This limits the amount of CPU resources consumed by datagram generation,
 /// and allows other tasks (like receiving ACKs) to run in between.
 const MAX_TRANSMIT_DATAGRAMS: usize = 20;
+
+/// The maximum amount of datagrams that are sent in a single transmit
+///
+/// This can be lower than the maximum platform capabilities, to avoid excessive
+/// memory allocations when calling `poll_transmit()`. Benchmarks have shown
+/// that numbers around 10 are a good compromise.
+const MAX_TRANSMIT_SEGMENTS: usize = 10;

quinn/src/runtime.rs

@@ -171,8 +171,7 @@ where
             // obtain an `&mut WritableFut` after storing it in `self.writable_fut` when `self` is already behind `Pin`,
             // and if we didn't store it then we wouldn't be able to keep it alive between
             // `poll_send` calls.
-            let result =
-                std::task::ready!(this.writable_fut.as_mut().as_pin_mut().unwrap().poll(cx));
+            let result = ready!(this.writable_fut.as_mut().as_pin_mut().unwrap().poll(cx));
 
             // Polling an arbitrary `Future` after it becomes ready is a logic error, so arrange for
             // a new `Future` to be created on the next call.