diff --git a/wsdl-parser/src/parser/port_type.rs b/wsdl-parser/src/parser/port_type.rs
index b3998644..2dc1126b 100644
--- a/wsdl-parser/src/parser/port_type.rs
+++ b/wsdl-parser/src/parser/port_type.rs
@@ -147,8 +147,8 @@ impl<'a> OperationType<'a> {
                         assert_eq!(
                             output_node.wsdl_type(),
                             ElementType::Output,
-                            "{}",
-                            format!("{:?}", output_node)
+                            "{:?}",
+                            output_node
                         );
                         OperationType::RequestResponse {
                             input: Param::new(&ch),
diff --git a/xsd-parser/src/parser/union.rs b/xsd-parser/src/parser/union.rs
index 55dff7a8..1d40f448 100644
--- a/xsd-parser/src/parser/union.rs
+++ b/xsd-parser/src/parser/union.rs
@@ -12,7 +12,7 @@ use std::cell::RefCell;
 pub fn parse_union(union: &Node) -> RsEntity {
     let mut cases = union
         .attribute(attribute::MEMBER_TYPES)
-        .map(|s| create_enum_cases(s))
+        .map(create_enum_cases)
         .unwrap_or_else(Vec::new);
 
     let subtypes = union
diff --git a/xsd-types/src/types/decimal.rs b/xsd-types/src/types/decimal.rs
index 06764421..2951b45c 100644
--- a/xsd-types/src/types/decimal.rs
+++ b/xsd-types/src/types/decimal.rs
@@ -26,7 +26,7 @@ impl FromStr for Decimal {
 
 impl fmt::Display for Decimal {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "{}", self.0.to_string())
+        write!(f, "{}", self.0)
     }
 }
 
diff --git a/xsd-types/src/types/duration.rs b/xsd-types/src/types/duration.rs
index ed77bfd0..575807f7 100644
--- a/xsd-types/src/types/duration.rs
+++ b/xsd-types/src/types/duration.rs
@@ -1,4 +1,5 @@
 use std::fmt;
+use std::fmt::Write;
 use std::str::FromStr;
 use xsd_macro_utils::UtilsDefaultSerde;
 
@@ -166,7 +167,7 @@ impl FromStr for Duration {
                     context.is_dot_found = true;
                 }
                 digit => {
-                    if !digit.is_digit(10) {
+                    if !digit.is_ascii_digit() {
                         return Err("Incorrect character occurred".into());
                     }
 
@@ -215,24 +216,24 @@ impl fmt::Display for Duration {
 
         let mut date_str = String::new();
         if self.years > 0 {
-            date_str.push_str(&format!("{}Y", self.years));
+            write!(&mut date_str, "{}Y", self.years)?;
         }
         if self.months > 0 {
-            date_str.push_str(&format!("{}M", self.months));
+            write!(&mut date_str, "{}M", self.months)?;
         }
         if self.days > 0 {
-            date_str.push_str(&format!("{}D", self.days));
+            write!(&mut date_str, "{}D", self.days)?;
         }
 
         let mut time_str = String::new();
         if self.hours > 0 {
-            time_str.push_str(&format!("{}H", self.hours));
+            write!(&mut time_str, "{}H", self.hours)?;
         }
         if self.minutes > 0 {
-            time_str.push_str(&format!("{}M", self.minutes));
+            write!(&mut time_str, "{}M", self.minutes)?;
         }
         if self.seconds > 0.0 {
-            time_str.push_str(&format!("{}S", self.seconds));
+            write!(&mut time_str, "{}S", self.seconds)?;
         }
 
         if time_str.is_empty() {
diff --git a/xsd-types/src/types/gday.rs b/xsd-types/src/types/gday.rs
index 928e4c57..be23d716 100644
--- a/xsd-types/src/types/gday.rs
+++ b/xsd-types/src/types/gday.rs
@@ -41,7 +41,7 @@ impl FromStr for GDay {
                 return Err("bad gDay format".to_string());
             }
             let token = &s[3..5];
-            if !token.chars().all(|c| c.is_digit(10)) {
+            if !token.chars().all(|c| c.is_ascii_digit()) {
                 return Err("bad gDay format".to_string());
             }
             token.parse::<i32>().map_err(|e| e.to_string())
diff --git a/xsd-types/src/types/gmonth.rs b/xsd-types/src/types/gmonth.rs
index 8484531e..fedca307 100644
--- a/xsd-types/src/types/gmonth.rs
+++ b/xsd-types/src/types/gmonth.rs
@@ -41,7 +41,7 @@ impl FromStr for GMonth {
                 return Err("bad gMonth format".to_string());
             }
             let token = &s[2..4];
-            if !token.chars().all(|c| c.is_digit(10)) {
+            if !token.chars().all(|c| c.is_ascii_digit()) {
                 return Err("bad gMonth format".to_string());
             }
             token.parse::<i32>().map_err(|e| e.to_string())
diff --git a/xsd-types/src/types/gmonthday.rs b/xsd-types/src/types/gmonthday.rs
index 72253eda..37ef525c 100644
--- a/xsd-types/src/types/gmonthday.rs
+++ b/xsd-types/src/types/gmonthday.rs
@@ -71,13 +71,13 @@ impl FromStr for GMonthDay {
             }
 
             let month_token = &s[2..4];
-            if !month_token.chars().all(|c| c.is_digit(10)) {
+            if !month_token.chars().all(|c| c.is_ascii_digit()) {
                 return Err("bad month format within gMonthDay".to_string());
             }
             let month = month_token.parse::<i32>().map_err(|e| e.to_string())?;
 
             let day_token = &s[5..7];
-            if !day_token.chars().all(|c| c.is_digit(10)) {
+            if !day_token.chars().all(|c| c.is_ascii_digit()) {
                 return Err("bad day format within gMonthDay".to_string());
             }
             let day = day_token.parse::<i32>().map_err(|e| e.to_string())?;
diff --git a/xsd-types/src/types/gyear.rs b/xsd-types/src/types/gyear.rs
index b6296212..8e2d8596 100644
--- a/xsd-types/src/types/gyear.rs
+++ b/xsd-types/src/types/gyear.rs
@@ -53,7 +53,7 @@ fn parse_str_positive(s: &str) -> Result<GYear, String> {
         if s.len() < 4 {
             return Err("bad gYear format: to short".to_string());
         }
-        if !s.chars().all(|c| c.is_digit(10)) {
+        if !s.chars().all(|c| c.is_ascii_digit()) {
             return Err("bad gYear format".to_string());
         }
         s.parse::<i32>().map_err(|e| e.to_string())
diff --git a/xsd-types/src/types/gyearmonth.rs b/xsd-types/src/types/gyearmonth.rs
index eea59617..2af9fabe 100644
--- a/xsd-types/src/types/gyearmonth.rs
+++ b/xsd-types/src/types/gyearmonth.rs
@@ -86,12 +86,12 @@ fn parse_str_positive(s: &str) -> Result<GYearMonth, String> {
             return Err("bad gYearMonth format".to_string());
         }
 
-        if !year_token.chars().all(|c| c.is_digit(10)) {
+        if !year_token.chars().all(|c| c.is_ascii_digit()) {
             return Err("bad year format within gYearMonth".to_string());
         }
         let year = year_token.parse::<i32>().map_err(|e| e.to_string())?;
 
-        if !month_token.chars().all(|c| c.is_digit(10)) {
+        if !month_token.chars().all(|c| c.is_ascii_digit()) {
             return Err("bad month format within gYearMonth".to_string());
         }
         let month = month_token.parse::<i32>().map_err(|e| e.to_string())?;
diff --git a/xsd-types/src/types/utils.rs b/xsd-types/src/types/utils.rs
index 51b7ee21..f2cd6bb1 100644
--- a/xsd-types/src/types/utils.rs
+++ b/xsd-types/src/types/utils.rs
@@ -10,7 +10,7 @@ pub fn parse_timezone(s: &str) -> Result<FixedOffset, String> {
     if tokens.len() != 2 || tokens[0].len() != 2 || tokens[1].len() != 2 {
         return Err("bad timezone format".to_string());
     }
-    if !tokens.iter().all(|t| t.chars().all(|c| c.is_digit(10))) {
+    if !tokens.iter().all(|t| t.chars().all(|c| c.is_ascii_digit())) {
         return Err("bad timezone format".to_string());
     }