refactor(lib): replace deprecated numeric api with primitive one

Author: tottoto

src/body/length.rs

@@ -15,11 +15,11 @@ impl From<Option<u64>> for DecodedLength {
 }
 
 #[cfg(any(feature = "http1", feature = "http2", test))]
-const MAX_LEN: u64 = std::u64::MAX - 2;
+const MAX_LEN: u64 = u64::MAX - 2;
 
 impl DecodedLength {
-    pub(crate) const CLOSE_DELIMITED: DecodedLength = DecodedLength(::std::u64::MAX);
-    pub(crate) const CHUNKED: DecodedLength = DecodedLength(::std::u64::MAX - 1);
+    pub(crate) const CLOSE_DELIMITED: DecodedLength = DecodedLength(u64::MAX);
+    pub(crate) const CHUNKED: DecodedLength = DecodedLength(u64::MAX - 1);
     pub(crate) const ZERO: DecodedLength = DecodedLength(0);
 
     #[cfg(test)]

src/client/conn/http2.rs

@@ -406,7 +406,7 @@ where
     ///
     /// The value must be no larger than `u32::MAX`.
     pub fn max_send_buf_size(&mut self, max: usize) -> &mut Self {
-        assert!(max <= std::u32::MAX as usize);
+        assert!(max <= u32::MAX as usize);
         self.h2_builder.max_send_buffer_size = max;
         self
     }

src/proto/h1/decode.rs

@@ -2,7 +2,6 @@ use std::error::Error as StdError;
 use std::fmt;
 use std::io;
 use std::task::{Context, Poll};
-use std::usize;
 
 use bytes::{BufMut, Bytes, BytesMut};
 use futures_util::ready;

src/server/conn/http2.rs

@@ -247,7 +247,7 @@ impl<E> Builder<E> {
     ///
     /// The value must be no larger than `u32::MAX`.
     pub fn max_send_buf_size(&mut self, max: usize) -> &mut Self {
-        assert!(max <= std::u32::MAX as usize);
+        assert!(max <= u32::MAX as usize);
         self.h2_builder.max_send_buffer_size = max;
         self
     }