diff --git a/core/io/io.odin b/core/io/io.odin
index 47363bd28..0e39a4ef8 100644
--- a/core/io/io.odin
+++ b/core/io/io.odin
@@ -150,7 +150,7 @@ close :: proc(s: Closer) -> Error {
 	return .None;
 }
 
-flush :: proc(s: Flusher, p: []byte) -> Error {
+flush :: proc(s: Flusher) -> Error {
 	if s.stream_vtable != nil && s.impl_flush != nil {
 		return s->impl_flush();
 	}
@@ -158,7 +158,7 @@ flush :: proc(s: Flusher, p: []byte) -> Error {
 	return .None;
 }
 
-size :: proc(s: Stream, p: []byte) -> i64 {
+size :: proc(s: Stream) -> i64 {
 	if s.stream_vtable == nil {
 		return 0;
 	}
@@ -267,7 +267,21 @@ read_byte :: proc(r: Byte_Reader) -> (byte, Error) {
 	return b[0], err;
 }
 
-write_byte :: proc(w: Byte_Writer, c: byte) -> Error {
+write_byte :: proc{
+	write_byte_to_byte_writer,
+	write_byte_to_writer,
+};
+
+write_byte_to_byte_writer :: proc(w: Byte_Writer, c: byte) -> Error {
+	return _write_byte(auto_cast w, c);
+}
+
+write_byte_to_writer :: proc(w: Writer, c: byte) -> Error {
+	return _write_byte(auto_cast w, c);
+}
+
+@(private)
+_write_byte :: proc(w: Byte_Writer, c: byte) -> Error {
 	if w.stream_vtable == nil {
 		return .Empty;
 	}
diff --git a/core/io/util.odin b/core/io/util.odin
index bf1c223b8..e714ac7d0 100644
--- a/core/io/util.odin
+++ b/core/io/util.odin
@@ -1,6 +1,18 @@
 package io
 
 import "core:runtime"
+import "core:strconv"
+
+write_u64 :: proc(w: Writer, i: u64, base: int = 10) -> (n: int, err: Error) {
+	buf: [32]byte;
+	s := strconv.append_bits(buf[:], u64(i), base, false, 64, strconv.digits, nil);
+	return write_string(w, s);
+}
+write_i64 :: proc(w: Writer, i: i64, base: int = 10) -> (n: int, err: Error) {
+	buf: [32]byte;
+	s := strconv.append_bits(buf[:], u64(i), base, true, 64, strconv.digits, nil);
+	return write_string(w, s);
+}
 
 @(private)
 Tee_Reader :: struct {