diff --git a/vlib/gg/testdata/remove_image_from_cache.vv b/vlib/gg/testdata/remove_image_from_cache.vv
index 2b2385ed23..01eed818d1 100644
--- a/vlib/gg/testdata/remove_image_from_cache.vv
+++ b/vlib/gg/testdata/remove_image_from_cache.vv
@@ -17,7 +17,7 @@ fn frame(mut ctx gg.Context) {
 	ctx.begin()
 	id := ctx.new_streaming_image(ctx.width, ctx.height, 4, pixel_format: .rgba8)
 	mut img := ctx.get_cached_image_by_idx(id)
-	mut bytes := []byte{len: img.width * img.height * 4, cap: img.width * img.height * 4}
+	mut bytes := []u8{len: img.width * img.height * 4, cap: img.width * img.height * 4}
 	for y in 0 .. img.height {
 		for x in 0 .. img.width {
 			unsafe {
diff --git a/vlib/v/checker/tests/array_append_array_type_mismatch_err.vv b/vlib/v/checker/tests/array_append_array_type_mismatch_err.vv
index 45de913508..e2570c8625 100644
--- a/vlib/v/checker/tests/array_append_array_type_mismatch_err.vv
+++ b/vlib/v/checker/tests/array_append_array_type_mismatch_err.vv
@@ -1,5 +1,5 @@
 fn main() {
-	mut bc := []byte{}
+	mut bc := []u8{}
 	bc << [0xCA, 0xFE, 0xBA, 0xBE]
 	println(bc)
 }
diff --git a/vlib/v/checker/tests/c_fn_surplus_args.vv b/vlib/v/checker/tests/c_fn_surplus_args.vv
index e7c6466ded..30da2f34ad 100644
--- a/vlib/v/checker/tests/c_fn_surplus_args.vv
+++ b/vlib/v/checker/tests/c_fn_surplus_args.vv
@@ -1,6 +1,6 @@
 fn C.no() // untyped
 fn C.y1(int)
-fn C.ret()byte
+fn C.ret() u8
 
 fn main() {
 	C.no(1) // allowed
@@ -16,4 +16,4 @@ fn main() {
 }
 
 [trusted]
-fn C.af()int
+fn C.af() int
diff --git a/vlib/v/checker/tests/cast_string_err.vv b/vlib/v/checker/tests/cast_string_err.vv
index 85d50c359c..19d27d7b26 100644
--- a/vlib/v/checker/tests/cast_string_err.vv
+++ b/vlib/v/checker/tests/cast_string_err.vv
@@ -26,7 +26,7 @@ fn main() {
 	sm := string(mm)
 	println(sm)
 	//
-	arr := []byte{}
+	arr := []u8{}
 	sa := string(arr)
 	println(sa)
 	//
diff --git a/vlib/v/checker/tests/compare_unsigned_signed.vv b/vlib/v/checker/tests/compare_unsigned_signed.vv
index ed6fc040ed..e880b58c00 100644
--- a/vlib/v/checker/tests/compare_unsigned_signed.vv
+++ b/vlib/v/checker/tests/compare_unsigned_signed.vv
@@ -9,7 +9,7 @@ fn main() {
 	// unsigned == literal
 	_ = byte(-1) == -1 // false!
 	_ = -1 == u16(-1) // false!
-	
+
 	// unsigned == signed
 	_ = u16(-1) == int(-1)
 	_ = int(-1) != byte(-1)
diff --git a/vlib/v/checker/tests/fixed_array_size_err.vv b/vlib/v/checker/tests/fixed_array_size_err.vv
index eb27c2bf8d..00becde95c 100644
--- a/vlib/v/checker/tests/fixed_array_size_err.vv
+++ b/vlib/v/checker/tests/fixed_array_size_err.vv
@@ -2,7 +2,7 @@ const size = -1
 
 fn main() {
 	a := [size]int{}
-	b := [0]byte{}
+	b := [0]u8{}
 	println(a)
 	println(b)
 }
diff --git a/vlib/v/checker/tests/fn_args.vv b/vlib/v/checker/tests/fn_args.vv
index 5cfdff5992..71760cf59b 100644
--- a/vlib/v/checker/tests/fn_args.vv
+++ b/vlib/v/checker/tests/fn_args.vv
@@ -1,4 +1,4 @@
-fn uu8(a byte) {}
+fn uu8(a u8) {}
 
 fn arr(a []int) {}
 
diff --git a/vlib/v/checker/tests/fn_var.vv b/vlib/v/checker/tests/fn_var.vv
index 0a48b5d740..c46eb7065a 100644
--- a/vlib/v/checker/tests/fn_var.vv
+++ b/vlib/v/checker/tests/fn_var.vv
@@ -1,8 +1,10 @@
-mut f := fn(i int) byte {}
+mut f := fn (i int) u8 {}
 f = 4
 mut p := &f
 p = &[f]
 _ = p
 i := 0
 println(i)
-f = fn(mut a []int) { println(i) }
+f = fn (mut a []int) {
+	println(i)
+}
diff --git a/vlib/v/checker/tests/if_mut_with_immutable_var_err.vv b/vlib/v/checker/tests/if_mut_with_immutable_var_err.vv
index 4c84c91420..429c17b8cd 100644
--- a/vlib/v/checker/tests/if_mut_with_immutable_var_err.vv
+++ b/vlib/v/checker/tests/if_mut_with_immutable_var_err.vv
@@ -1,10 +1,10 @@
-type Int = byte | int
+type Int = int | u8
 
 fn main() {
 	i := Int(0)
 	if mut i is int {
 		i = 1
-	} else if mut i is byte {
+	} else if mut i is u8 {
 		i = 2
 	}
 	println(i)
diff --git a/vlib/v/checker/tests/immutable_builtin_modify.vv b/vlib/v/checker/tests/immutable_builtin_modify.vv
index e6cb7060b8..5f06db98c2 100644
--- a/vlib/v/checker/tests/immutable_builtin_modify.vv
+++ b/vlib/v/checker/tests/immutable_builtin_modify.vv
@@ -1,5 +1,5 @@
 s := ''
 s.len = 123
 //
-b := []byte{}
+b := []u8{}
 b.len = 34
diff --git a/vlib/v/checker/tests/is_type_invalid.vv b/vlib/v/checker/tests/is_type_invalid.vv
index 2e7f774567..a2afa2ca88 100644
--- a/vlib/v/checker/tests/is_type_invalid.vv
+++ b/vlib/v/checker/tests/is_type_invalid.vv
@@ -11,7 +11,7 @@ fn (d Dog) speak() {}
 struct Cat {}
 
 fn main() {
-	if IoS(1) is byte {
+	if IoS(1) is u8 {
 		println('not cool')
 	}
 	a := Animal(Dog{})
diff --git a/vlib/v/checker/tests/match_mut_with_immutable_var_err.vv b/vlib/v/checker/tests/match_mut_with_immutable_var_err.vv
index 56a5760808..18c3292963 100644
--- a/vlib/v/checker/tests/match_mut_with_immutable_var_err.vv
+++ b/vlib/v/checker/tests/match_mut_with_immutable_var_err.vv
@@ -1,4 +1,4 @@
-type Int = byte | int
+type Int = int | u8
 
 fn main() {
 	i := Int(0)
diff --git a/vlib/v/checker/tests/optional_or_block_none_err.vv b/vlib/v/checker/tests/optional_or_block_none_err.vv
index c1970a306e..45315d381f 100644
--- a/vlib/v/checker/tests/optional_or_block_none_err.vv
+++ b/vlib/v/checker/tests/optional_or_block_none_err.vv
@@ -1,22 +1,22 @@
 module main
 
 struct Animal {
-	mut:
-		height byte
+mut:
+	height u8
 }
 
-fn new_animal(height byte) ?Animal {
+fn new_animal(height u8) ?Animal {
 	if height < 10 {
 		return error('Too small to be an animal!')
 	}
 
-	return Animal{ height: height }
+	return Animal{
+		height: height
+	}
 }
 
 fn main() {
-	mut dog := new_animal(9) or {
-		none
-	}
+	mut dog := new_animal(9) or { none }
 
 	println(dog)
 }
diff --git a/vlib/v/checker/tests/ptr_slice.vv b/vlib/v/checker/tests/ptr_slice.vv
index 2249ab9039..e36c8e7a2f 100644
--- a/vlib/v/checker/tests/ptr_slice.vv
+++ b/vlib/v/checker/tests/ptr_slice.vv
@@ -2,12 +2,12 @@ struct Foo {
 }
 
 fn jeje() &Foo {
-    return &Foo{}
+	return &Foo{}
 }
 
 fn main() {
-    fs := jeje()[1..]
-    println(fs)
-    vs := byteptr(0)[..3]
-    println(vs)
+	fs := jeje()[1..]
+	println(fs)
+	vs := byteptr(0)[..3]
+	println(vs)
 }
diff --git a/vlib/v/checker/tests/struct_type_cast_err.vv b/vlib/v/checker/tests/struct_type_cast_err.vv
index a27eefdb81..2a28ae2793 100644
--- a/vlib/v/checker/tests/struct_type_cast_err.vv
+++ b/vlib/v/checker/tests/struct_type_cast_err.vv
@@ -1,17 +1,17 @@
-struct Foo{}
+struct Foo {}
 
 fn main() {
-    foo := Foo{}
-    _ := string(foo)
-    _ := int(foo)
-    _ := u64(foo)
-    _ := u32(foo)
-    _ := rune(foo)
-    _ := byte(foo)
-    _ := i8(foo)
-    _ := i64(foo)
-    _ := int(foo)
-    _ = &I1(foo)
+	foo := Foo{}
+	_ := string(foo)
+	_ := int(foo)
+	_ := u64(foo)
+	_ := u32(foo)
+	_ := rune(foo)
+	_ := byte(foo)
+	_ := i8(foo)
+	_ := i64(foo)
+	_ := int(foo)
+	_ = &I1(foo)
 }
 
-interface I1{}
+interface I1 {}
diff --git a/vlib/v/fmt/tests/array_newlines_keep.vv b/vlib/v/fmt/tests/array_newlines_keep.vv
index 11fded188f..f8667795e0 100644
--- a/vlib/v/fmt/tests/array_newlines_keep.vv
+++ b/vlib/v/fmt/tests/array_newlines_keep.vv
@@ -11,7 +11,7 @@ fn main() {
 	]
 	x := []int{len: 10, cap: 100, init: 1}
 	_ := expected_flags
-	buf := [100]byte{}
+	buf := [100]u8{}
 	println(x)
 	println(buf)
 }
diff --git a/vlib/v/fmt/tests/comptime_keep.vv b/vlib/v/fmt/tests/comptime_keep.vv
index 987e513dd7..da5aa7884d 100644
--- a/vlib/v/fmt/tests/comptime_keep.vv
+++ b/vlib/v/fmt/tests/comptime_keep.vv
@@ -11,7 +11,7 @@ pub:
 	f u64
 pub mut:
 	g string
-	h byte
+	h u8
 }
 
 fn comptime_for() {
diff --git a/vlib/v/fmt/tests/fixed_size_array_type_keep.vv b/vlib/v/fmt/tests/fixed_size_array_type_keep.vv
index fbe0001a14..3c91216679 100644
--- a/vlib/v/fmt/tests/fixed_size_array_type_keep.vv
+++ b/vlib/v/fmt/tests/fixed_size_array_type_keep.vv
@@ -18,11 +18,11 @@ fn main() {
 // from another .v file
 
 struct VerifyKey {
-	public_key [public_key_size]byte
+	public_key [public_key_size]u8
 }
 
 struct SigningKey {
-	secret_key [secret_key_size]byte
+	secret_key [secret_key_size]u8
 pub:
 	verify_key VerifyKey
 }
diff --git a/vlib/v/fmt/tests/fn_headers_with_no_bodies_keep.vv b/vlib/v/fmt/tests/fn_headers_with_no_bodies_keep.vv
index 98d04768d2..9b6d22119a 100644
--- a/vlib/v/fmt/tests/fn_headers_with_no_bodies_keep.vv
+++ b/vlib/v/fmt/tests/fn_headers_with_no_bodies_keep.vv
@@ -2,4 +2,4 @@ fn proc_pidpath(int, voidptr, int) int
 
 fn C.realpath(&char, &char) &char
 
-fn C.chmod(&byte, int) int
+fn C.chmod(&u8, int) int
diff --git a/vlib/v/fmt/tests/fn_with_anon_params_keep.vv b/vlib/v/fmt/tests/fn_with_anon_params_keep.vv
index ab6a13ab77..cc01a9f2d3 100644
--- a/vlib/v/fmt/tests/fn_with_anon_params_keep.vv
+++ b/vlib/v/fmt/tests/fn_with_anon_params_keep.vv
@@ -1 +1 @@
-fn C.PQgetvalue(voidptr, int, int) &byte
+fn C.PQgetvalue(voidptr, int, int) &u8
diff --git a/vlib/v/fmt/tests/interface_declaration_comments_keep.vv b/vlib/v/fmt/tests/interface_declaration_comments_keep.vv
index 8a7a6d94f8..c74c3a6608 100644
--- a/vlib/v/fmt/tests/interface_declaration_comments_keep.vv
+++ b/vlib/v/fmt/tests/interface_declaration_comments_keep.vv
@@ -1,6 +1,6 @@
 pub interface ReaderWriter {
-	read(mut buf []byte) ?int // from Reader
-	write(buf []byte) ?int // from Writer
+	read(mut buf []u8) ?int // from Reader
+	write(buf []u8) ?int // from Writer
 }
 
 interface Speaker {
diff --git a/vlib/v/fmt/tests/match_range_expression_branches_keep.vv b/vlib/v/fmt/tests/match_range_expression_branches_keep.vv
index ae99b0ff35..25303b9470 100644
--- a/vlib/v/fmt/tests/match_range_expression_branches_keep.vv
+++ b/vlib/v/fmt/tests/match_range_expression_branches_keep.vv
@@ -1,4 +1,4 @@
-pub fn str_escaped(b byte) string {
+pub fn str_escaped(b u8) string {
 	str := match b {
 		0 { '`\\' + '0`' } // Bug is preventing \\0 in a literal
 		7 { '`\\a`' }
diff --git a/vlib/v/fmt/tests/struct_init_with_comments_keep.vv b/vlib/v/fmt/tests/struct_init_with_comments_keep.vv
index 60576b2d49..303b8a70ef 100644
--- a/vlib/v/fmt/tests/struct_init_with_comments_keep.vv
+++ b/vlib/v/fmt/tests/struct_init_with_comments_keep.vv
@@ -3,7 +3,7 @@ module abcde
 pub struct Builder {
 pub mut:
 	// inline before field
-	buf          []byte
+	buf          []u8
 	str_calls    int
 	len          int
 	initial_size int = 1
@@ -12,7 +12,7 @@ pub mut:
 pub fn new_builder(initial_size int) Builder {
 	return Builder{
 		// buf: make(0, initial_size)
-		buf: []byte{cap: initial_size}
+		buf: []u8{cap: initial_size}
 		str_calls: 0 // after str_calls
 		len: 0 // after len
 		initial_size: initial_size // final
diff --git a/vlib/v/fmt/tests/symbol_registration_keep.vv b/vlib/v/fmt/tests/symbol_registration_keep.vv
index 66b201d78e..c9fdb5d828 100644
--- a/vlib/v/fmt/tests/symbol_registration_keep.vv
+++ b/vlib/v/fmt/tests/symbol_registration_keep.vv
@@ -14,7 +14,7 @@ mut:
 	store       &Store = &Store(0)
 	cursor      TreeCursor
 	module_name string
-	src_text    []byte
+	src_text    []u8
 	// skips the local scopes and registers only
 	// the top-level ones regardless of its
 	// visibility
diff --git a/vlib/v/fmt/tests/types_expected.vv b/vlib/v/fmt/tests/types_expected.vv
index 1eed4362d6..b90e5be8e1 100644
--- a/vlib/v/fmt/tests/types_expected.vv
+++ b/vlib/v/fmt/tests/types_expected.vv
@@ -2,7 +2,7 @@
 type FooBar = Bar | Foo
 pub type PublicBar = Bar | Foo | FooBar
 
-type Uint = byte | u16 | u32 | u64 // This should stay on the same line
+type Uint = u16 | u32 | u64 | u8 // This should stay on the same line
 type Float = f32 | f64
 
 // Alias type
diff --git a/vlib/v/fmt/tests/union_keep.vv b/vlib/v/fmt/tests/union_keep.vv
index 5872d03643..f47d84f3a8 100644
--- a/vlib/v/fmt/tests/union_keep.vv
+++ b/vlib/v/fmt/tests/union_keep.vv
@@ -1,4 +1,4 @@
 union Un {
 	i int
-	b byte
+	b u8
 }
diff --git a/vlib/v/parser/tests/struct_module_section.vv b/vlib/v/parser/tests/struct_module_section.vv
index d15a49ceaf..932d348f26 100644
--- a/vlib/v/parser/tests/struct_module_section.vv
+++ b/vlib/v/parser/tests/struct_module_section.vv
@@ -1,6 +1,6 @@
 struct S1 {
 pub mut:
-	v byte
+	v u8
 module:
 	i int
 }
@@ -9,7 +9,7 @@ struct S2 {
 module:
 	j int
 mut:
-	v byte
+	v u8
 }
 
 mut s := S1{}
diff --git a/vlib/v/tests/inout/dump_expression.vv b/vlib/v/tests/inout/dump_expression.vv
index 713d172249..96bdcd8f32 100644
--- a/vlib/v/tests/inout/dump_expression.vv
+++ b/vlib/v/tests/inout/dump_expression.vv
@@ -37,7 +37,7 @@ fn dump_of_callexpr() {
 	vfile := @FILE
 	dump(os.file_name(vfile))
 	mut f := os.open_file(@FILE, 'r') or { return }
-	mut buf := []byte{len: 10}
+	mut buf := []u8{len: 10}
 	dump(f.read(mut buf) or { -999 })
 	f.close()
 }
diff --git a/vlib/v/tests/inout/printing_alias_has_str_method.vv b/vlib/v/tests/inout/printing_alias_has_str_method.vv
index 3b79901af9..0d610df2fb 100644
--- a/vlib/v/tests/inout/printing_alias_has_str_method.vv
+++ b/vlib/v/tests/inout/printing_alias_has_str_method.vv
@@ -1,4 +1,4 @@
-type Byte = byte
+type Byte = u8
 
 fn (b Byte) str() string {
 	return 'hello'