diff --git a/src/base/component/block.rs b/src/base/component/block.rs
index dbd76eb8..30b0181d 100644
--- a/src/base/component/block.rs
+++ b/src/base/component/block.rs
@@ -22,7 +22,7 @@ impl ComponentTrait for Block {
     fn setup_before_prepare(&mut self, _cx: &mut Context) {
         self.alter_classes(
             ClassesOp::Prepend,
-            [String::from("block__container"), self.style().to_string()].join(" "),
+            ["block__container".to_string(), self.style().to_string()].join(" "),
         );
     }
 
diff --git a/src/base/component/button.rs b/src/base/component/button.rs
index 865a583f..b97a2671 100644
--- a/src/base/component/button.rs
+++ b/src/base/component/button.rs
@@ -37,7 +37,7 @@ impl ComponentTrait for Button {
         self.alter_classes(
             ClassesOp::Prepend,
             [
-                String::from("button__tap"),
+                "button__tap".to_string(),
                 self.style().to_string(),
                 self.font_size().to_string(),
             ]
diff --git a/src/base/component/flex/container.rs b/src/base/component/flex/container.rs
index 46a0b696..7bf5ac62 100644
--- a/src/base/component/flex/container.rs
+++ b/src/base/component/flex/container.rs
@@ -38,7 +38,7 @@ impl ComponentTrait for Container {
         self.alter_classes(
             ClassesOp::Prepend,
             [
-                String::from("flex__container"),
+                "flex__container".to_string(),
                 self.direction().to_string(),
                 self.wrap().to_string(),
                 self.justify().to_string(),
diff --git a/src/base/component/flex/item.rs b/src/base/component/flex/item.rs
index 680ab2e8..532e4e96 100644
--- a/src/base/component/flex/item.rs
+++ b/src/base/component/flex/item.rs
@@ -36,7 +36,7 @@ impl ComponentTrait for Item {
         self.alter_classes(
             ClassesOp::Prepend,
             [
-                String::from("flex__item"),
+                "flex__item".to_string(),
                 self.grow().to_string(),
                 self.shrink().to_string(),
                 self.size().to_string(),
diff --git a/src/base/component/form/action_button.rs b/src/base/component/form/action_button.rs
index 72a75554..e0cf2eb0 100644
--- a/src/base/component/form/action_button.rs
+++ b/src/base/component/form/action_button.rs
@@ -41,7 +41,7 @@ impl ComponentTrait for ActionButton {
         self.alter_classes(
             ClassesOp::Prepend,
             [
-                String::from("button__tap"),
+                "button__tap".to_string(),
                 self.style().to_string(),
                 self.font_size().to_string(),
             ]
diff --git a/src/util.rs b/src/util.rs
index 12a0cb37..4f63f0f9 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -59,7 +59,7 @@ impl TypeInfo {
             .get(if start >= 0 {
                 start as usize
             } else {
-                segments.len() - start.abs() as usize
+                segments.len() - start.unsigned_abs()
             })
             .map_or(0, |&(s, _)| s);
 
@@ -69,7 +69,7 @@ impl TypeInfo {
                 if end >= 0 {
                     end as usize
                 } else {
-                    segments.len() - end.abs() as usize
+                    segments.len() - end.unsigned_abs()
                 }
             } else {
                 segments.len() - 1