message: Use zero as the unknown error code when sending a STOP_SENDING frame
diff: @@ -27,7 +27,7 @@ impl core::fmt::Debug for Error {
  impl Error {
  /// An error code that can be used when the application cannot provide
  /// a more meaningful code.
  - pub const UNKNOWN: Self = Self(VarInt::MAX);
  + pub const UNKNOWN: Self = Self(VarInt::from_u8(0));
  /// Creates an `ApplicationErrorCode` from an unsigned integer.
  ///
  