diff --git a/vlib/builtin/int.v b/vlib/builtin/int.v
index 00a44820a2..43e66566a7 100644
--- a/vlib/builtin/int.v
+++ b/vlib/builtin/int.v
@@ -484,7 +484,10 @@ pub fn (b byte) str_escaped() string {
 	return str
 }
 
-// Define this on byte as well, so that we can do `s[0].is_capital()`
+// is_capital returns `true`, if the byte is a Latin capital letter.
+// Example: assert `H`.is_capital() == true
+// Example: assert 'h`.is_capital() == false
+[inline]
 pub fn (c byte) is_capital() bool {
 	return c >= `A` && c <= `Z`
 }
diff --git a/vlib/builtin/js/byte.js.v b/vlib/builtin/js/byte.js.v
index 0a75772f10..48e18e46ed 100644
--- a/vlib/builtin/js/byte.js.v
+++ b/vlib/builtin/js/byte.js.v
@@ -30,6 +30,7 @@ pub fn (c byte) repeat(count int) string {
 	return res
 }
 
+[inline]
 pub fn (c byte) is_digit() bool {
 	return c >= `0` && c <= `9`
 }
@@ -38,7 +39,7 @@ pub fn (c byte) is_digit() bool {
 // Example: assert byte(`F`) == true
 [inline]
 pub fn (c byte) is_hex_digit() bool {
-	return c.is_digit() || (c >= `a` && c <= `f`) || (c >= `A` && c <= `F`)
+	return (c >= `0` && c <= `9`) || (c >= `a` && c <= `f`) || (c >= `A` && c <= `F`)
 }
 
 // is_oct_digit returns `true` if the byte is in range 0-7 and `false` otherwise.
@@ -66,10 +67,13 @@ pub fn (c byte) is_letter() bool {
 // Example: assert byte(`V`) == true
 [inline]
 pub fn (c byte) is_alnum() bool {
-	return c.is_letter() || c.is_digit()
+	return (c >= `a` && c <= `z`) || (c >= `A` && c <= `Z`) || (c >= `0` && c <= `9`)
 }
 
-// Define this on byte as well, so that we can do `s[0].is_capital()`
+// is_capital returns `true`, if the byte is a Latin capital letter.
+// Example: assert `H`.is_capital() == true
+// Example: assert 'h`.is_capital() == false
+[inline]
 pub fn (c byte) is_capital() bool {
 	return c >= `A` && c <= `Z`
 }
diff --git a/vlib/builtin/js/string.js.v b/vlib/builtin/js/string.js.v
index 9e51b9a3c1..7fecc19ef9 100644
--- a/vlib/builtin/js/string.js.v
+++ b/vlib/builtin/js/string.js.v
@@ -817,8 +817,10 @@ pub fn (s string) is_title() bool {
 	return true
 }
 
-// is_capital returns `true` if the first character in the string is a capital letter.
+// is_capital returns `true`, if the first character in the string `s`,
+// is a capital letter, and the rest are NOT.
 // Example: assert 'Hello'.is_capital() == true
+// Example: assert 'HelloWorld'.is_capital() == false
 [direct_array_access]
 pub fn (s string) is_capital() bool {
 	if s.len == 0 || !(s[0] >= `A` && s[0] <= `Z`) {
@@ -832,6 +834,18 @@ pub fn (s string) is_capital() bool {
 	return true
 }
 
+// starts_with_capital returns `true`, if the first character in the string `s`,
+// is a capital letter, even if the rest are not.
+// Example: assert 'Hello'.starts_with_capital() == true
+// Example: assert 'Hello. World.'.starts_with_capital() == true
+[direct_array_access]
+pub fn (s string) starts_with_capital() bool {
+	if s.len == 0 || !(s[0] >= `A` && s[0] <= `Z`) {
+		return false
+	}
+	return true
+}
+
 // is_upper returns `true` if all characters in the string is uppercase.
 // Example: assert 'HELLO V'.is_upper() == true
 pub fn (s string) is_upper() bool {
diff --git a/vlib/builtin/js/string_test.js.v b/vlib/builtin/js/string_test.js.v
index 71c608658e..953e7480bb 100644
--- a/vlib/builtin/js/string_test.js.v
+++ b/vlib/builtin/js/string_test.js.v
@@ -669,6 +669,14 @@ fn test_starts_with() {
 	assert s.starts_with('Language') == false
 }
 
+fn test_starts_with_capital() {
+	assert 'A sentence'.starts_with_capital()
+	assert 'A paragraph. It also does.'.starts_with_capital()
+	assert ''.starts_with_capital() == false
+	assert 'no'.starts_with_capital() == false
+	assert ' No'.starts_with_capital() == false
+}
+
 fn test_trim_prefix() {
 	s := 'V Programming Language'
 	assert s.trim_prefix('V ') == 'Programming Language'
diff --git a/vlib/builtin/string.v b/vlib/builtin/string.v
index 50659192c8..6c54feedf7 100644
--- a/vlib/builtin/string.v
+++ b/vlib/builtin/string.v
@@ -1041,8 +1041,10 @@ pub fn (s string) capitalize() string {
 	return res
 }
 
-// is_capital returns `true` if the first character in the string is a capital letter.
+// is_capital returns `true`, if the first character in the string `s`,
+// is a capital letter, and the rest are NOT.
 // Example: assert 'Hello'.is_capital() == true
+// Example: assert 'HelloWorld'.is_capital() == false
 [direct_array_access]
 pub fn (s string) is_capital() bool {
 	if s.len == 0 || !(s[0] >= `A` && s[0] <= `Z`) {
@@ -1056,6 +1058,18 @@ pub fn (s string) is_capital() bool {
 	return true
 }
 
+// starts_with_capital returns `true`, if the first character in the string `s`,
+// is a capital letter, even if the rest are not.
+// Example: assert 'Hello'.starts_with_capital() == true
+// Example: assert 'Hello. World.'.starts_with_capital() == true
+[direct_array_access]
+pub fn (s string) starts_with_capital() bool {
+	if s.len == 0 || !(s[0] >= `A` && s[0] <= `Z`) {
+		return false
+	}
+	return true
+}
+
 // title returns the string with each word capitalized.
 // Example: assert 'hello v developer'.title() == 'Hello V Developer'
 pub fn (s string) title() string {
@@ -1068,7 +1082,7 @@ pub fn (s string) title() string {
 	return title
 }
 
-// is_title returns true if all words of the string is capitalized.
+// is_title returns true if all words of the string are capitalized.
 // Example: assert 'Hello V Developer'.is_title() == true
 pub fn (s string) is_title() bool {
 	words := s.split(' ')
@@ -1292,7 +1306,7 @@ pub fn (c byte) is_digit() bool {
 // Example: assert byte(`F`) == true
 [inline]
 pub fn (c byte) is_hex_digit() bool {
-	return c.is_digit() || (c >= `a` && c <= `f`) || (c >= `A` && c <= `F`)
+	return (c >= `0` && c <= `9`) || (c >= `a` && c <= `f`) || (c >= `A` && c <= `F`)
 }
 
 // is_oct_digit returns `true` if the byte is in range 0-7 and `false` otherwise.
@@ -1320,7 +1334,7 @@ pub fn (c byte) is_letter() bool {
 // Example: assert byte(`V`) == true
 [inline]
 pub fn (c byte) is_alnum() bool {
-	return c.is_letter() || c.is_digit()
+	return (c >= `a` && c <= `z`) || (c >= `A` && c <= `Z`) || (c >= `0` && c <= `9`)
 }
 
 // free allows for manually freeing the memory occupied by the string
diff --git a/vlib/builtin/string_test.v b/vlib/builtin/string_test.v
index 0773006f6e..e04b8c25a4 100644
--- a/vlib/builtin/string_test.v
+++ b/vlib/builtin/string_test.v
@@ -686,6 +686,14 @@ fn test_starts_with() {
 	assert s.starts_with('Language') == false
 }
 
+fn test_starts_with_capital() {
+	assert 'A sentence'.starts_with_capital()
+	assert 'A paragraph. It also does.'.starts_with_capital()
+	assert ''.starts_with_capital() == false
+	assert 'no'.starts_with_capital() == false
+	assert ' No'.starts_with_capital() == false
+}
+
 fn test_trim_prefix() {
 	s := 'V Programming Language'
 	assert s.trim_prefix('V ') == 'Programming Language'
diff --git a/vlib/v/ast/types.v b/vlib/v/ast/types.v
index 07c9ae9195..ab3ae1ec38 100644
--- a/vlib/v/ast/types.v
+++ b/vlib/v/ast/types.v
@@ -1184,8 +1184,12 @@ pub fn (t &TypeSymbol) embed_name() string {
 }
 
 pub fn (t &TypeSymbol) has_method(name string) bool {
-	t.find_method(name) or { return false }
-	return true
+	for method in t.methods {
+		if method.name == name {
+			return true
+		}
+	}
+	return false
 }
 
 pub fn (t &TypeSymbol) has_method_with_generic_parent(name string) bool {
@@ -1295,8 +1299,10 @@ pub fn (i &Interface) find_method(name string) ?Fn {
 }
 
 pub fn (i &Interface) has_method(name string) bool {
-	if _ := i.find_method(name) {
-		return true
+	for method in i.methods {
+		if method.name == name {
+			return true
+		}
 	}
 	return false
 }
diff --git a/vlib/v/util/scanning.v b/vlib/v/util/scanning.v
index 997ffa666d..eee3c5129b 100644
--- a/vlib/v/util/scanning.v
+++ b/vlib/v/util/scanning.v
@@ -7,7 +7,7 @@ pub fn is_name_char(c byte) bool {
 
 [inline]
 pub fn is_func_char(c byte) bool {
-	return (c >= `a` && c <= `z`) || (c >= `A` && c <= `Z`) || c == `_` || c.is_digit()
+	return (c >= `a` && c <= `z`) || (c >= `A` && c <= `Z`) || c == `_` || (c >= `0` && c <= `9`)
 }
 
 pub fn contains_capital(s string) bool {
@@ -21,6 +21,7 @@ pub fn contains_capital(s string) bool {
 
 // HTTPRequest  bad
 // HttpRequest  good
+[direct_array_access]
 pub fn good_type_name(s string) bool {
 	if s.len < 4 {
 		return true
@@ -34,9 +35,9 @@ pub fn good_type_name(s string) bool {
 }
 
 // is_generic_type_name returns true if the current token is a generic type name.
-[inline]
+[direct_array_access; inline]
 pub fn is_generic_type_name(name string) bool {
-	return name.len == 1 && name.is_capital() && name != 'C'
+	return name.len == 1 && name[0] != `C` && (name[0] >= `A` && name[0] <= `Z`)
 }
 
 pub fn cescaped_path(s string) string {