diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 9d9358b..392f84a 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -63,7 +63,7 @@ jobs:
       - name: install ruff
         run: python -m pip install ruff
       - name: run python lint
-        run: ruff check ast
+        run: ruff --ignore=E501 ast --show-source
 
       - name: spell checker
         uses: streetsidesoftware/cspell-action@v2
diff --git a/Cargo.toml b/Cargo.toml
index a9811e9..603ad3d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,5 +1,5 @@
 [workspace.package]
-version = "0.4.0"
+version = "0.3.1"
 authors = ["RustPython Team"]
 edition = "2021"
 rust-version = "1.72.1"
@@ -15,12 +15,12 @@ members = [
 ]
 
 [workspace.dependencies]
-rustpython-parser-vendored = { path = "vendored", version = "0.4.0" }
-rustpython-ast = { path = "ast", default-features = false, version = "0.4.0" }
-rustpython-parser-core = { path = "core", features = [], version = "0.4.0" }
-rustpython-literal = { path = "literal", version = "0.4.0" }
-rustpython-format = { path = "format", default-features = false, version = "0.4.0" }
-rustpython-parser = { path = "parser", default-features = false, version = "0.4.0" }
+rustpython-parser-vendored = { path = "vendored", version = "0.3.1" }
+rustpython-ast = { path = "ast", default-features = false, version = "0.3.1" }
+rustpython-parser-core = { path = "core", features = [], version = "0.3.1" }
+rustpython-literal = { path = "literal", version = "0.3.1" }
+rustpython-format = { path = "format", default-features = false, version = "0.3.1" }
+rustpython-parser = { path = "parser", default-features = false, version = "0.3.1" }
 
 anyhow = "1.0.45"
 bitflags = "2.4.0"
@@ -32,7 +32,7 @@ log = "0.4.16"
 num-complex = "0.4.0"
 num-bigint = "0.4.3"
 num-traits = "0.2"
-malachite-bigint = "0.2.3"
+malachite-bigint = "0.2.0"
 memchr = "2.5.0"
 rand = "0.8.5"
 serde = { version = "1.0.133", default-features = false }
diff --git a/ast/src/builtin.rs b/ast/src/builtin.rs
index 47dcc7b..1a64efb 100644
--- a/ast/src/builtin.rs
+++ b/ast/src/builtin.rs
@@ -128,10 +128,10 @@ pub enum Constant {
 
 impl Constant {
     pub fn is_true(self) -> bool {
-        self.bool().is_some_and(|b| b)
+        self.bool().map_or(false, |b| b)
     }
     pub fn is_false(self) -> bool {
-        self.bool().is_some_and(|b| !b)
+        self.bool().map_or(false, |b| !b)
     }
     pub fn complex(self) -> Option<(f64, f64)> {
         match self {
diff --git a/ast/src/lib.rs b/ast/src/lib.rs
index 143fac1..4e5d371 100644
--- a/ast/src/lib.rs
+++ b/ast/src/lib.rs
@@ -20,7 +20,7 @@ mod generic;
 mod impls;
 mod ranged;
 #[cfg(feature = "unparse")]
-pub mod unparse;
+mod unparse;
 
 #[cfg(feature = "malachite-bigint")]
 pub use malachite_bigint as bigint;
diff --git a/ast/src/source_locator.rs b/ast/src/source_locator.rs
index a72311d..c0a0f22 100644
--- a/ast/src/source_locator.rs
+++ b/ast/src/source_locator.rs
@@ -156,11 +156,11 @@ impl crate::fold::Fold<TextRange> for LinearLocator<'_> {
         let context = self.will_map_user(&range);
 
         let name = self.fold(name)?;
-        let type_params = self.fold(type_params)?;
         let bases = self.fold(bases)?;
         let keywords = self.fold(keywords)?;
         let body = self.fold(body)?;
         let range = self.map_user(range, context)?;
+        let type_params = self.fold(type_params)?;
 
         Ok(crate::StmtClassDef {
             name,
@@ -190,11 +190,11 @@ impl crate::fold::Fold<TextRange> for LinearLocator<'_> {
         let context = self.will_map_user(&range);
 
         let name = self.fold(name)?;
-        let type_params = self.fold(type_params)?;
         let args: Box<crate::Arguments<SourceRange>> = self.fold(args)?;
         let returns = self.fold(returns)?;
         let body = self.fold(body)?;
         let type_comment = self.fold(type_comment)?;
+        let type_params = self.fold(type_params)?;
         let range = self.map_user(range, context)?;
         Ok(crate::StmtFunctionDef {
             name,
@@ -225,11 +225,11 @@ impl crate::fold::Fold<TextRange> for LinearLocator<'_> {
         let context = self.will_map_user(&range);
 
         let name = self.fold(name)?;
-        let type_params = self.fold(type_params)?;
         let args: Box<crate::Arguments<SourceRange>> = self.fold(args)?;
         let returns = self.fold(returns)?;
         let body = self.fold(body)?;
         let type_comment = self.fold(type_comment)?;
+        let type_params = self.fold(type_params)?;
         let range = self.map_user(range, context)?;
         Ok(crate::StmtAsyncFunctionDef {
             name,
@@ -274,34 +274,6 @@ impl crate::fold::Fold<TextRange> for LinearLocator<'_> {
             keywords,
         })
     }
-
-    fn fold_pattern_match_mapping(
-        &mut self,
-        node: crate::PatternMatchMapping<TextRange>,
-    ) -> Result<crate::PatternMatchMapping<Self::TargetU>, Self::Error> {
-        let crate::PatternMatchMapping {
-            keys,
-            patterns,
-            rest,
-            range,
-        } = node;
-        let context = self.will_map_user(&range);
-
-        let mut located_keys = Vec::with_capacity(keys.len());
-        let mut located_patterns = Vec::with_capacity(patterns.len());
-        for (key, value) in keys.into_iter().zip(patterns.into_iter()) {
-            located_keys.push(self.fold(key)?);
-            located_patterns.push(self.fold(value)?);
-        }
-        let rest = self.fold(rest)?;
-        let range = self.map_user(range, context)?;
-        Ok(crate::PatternMatchMapping {
-            keys: located_keys,
-            patterns: located_patterns,
-            rest,
-            range,
-        })
-    }
 }
 
 struct LinearLookaheadLocator<'a, 'b>(&'b mut LinearLocator<'a>);
diff --git a/ast/src/unparse.rs b/ast/src/unparse.rs
index ae4a2d1..95c0ba5 100644
--- a/ast/src/unparse.rs
+++ b/ast/src/unparse.rs
@@ -379,7 +379,12 @@ impl<'a> Unparser<'a> {
             }
             Expr::Subscript(crate::ExprSubscript { value, slice, .. }) => {
                 self.unparse_expr(value, precedence::ATOM)?;
-                let lvl = precedence::TUPLE;
+                let mut lvl = precedence::TUPLE;
+                if let Expr::Tuple(crate::ExprTuple { elts, .. }) = slice.as_ref() {
+                    if elts.iter().any(|expr| expr.is_starred_expr()) {
+                        lvl += 1
+                    }
+                }
                 self.p("[")?;
                 self.unparse_expr(slice, lvl)?;
                 self.p("]")?;
diff --git a/format/src/format.rs b/format/src/format.rs
index bc1bec2..fd497b9 100644
--- a/format/src/format.rs
+++ b/format/src/format.rs
@@ -863,46 +863,17 @@ impl FormatString {
     }
 
     fn parse_part_in_brackets(text: &str) -> Result<FormatPart, FormatParseError> {
-        let mut chars = text.chars().peekable();
-
-        let mut left = String::new();
-        let mut right = String::new();
-
-        let mut split = false;
-        let mut selected = &mut left;
-        let mut inside_brackets = false;
-
-        while let Some(char) = chars.next() {
-            if char == '[' {
-                inside_brackets = true;
-
-                selected.push(char);
-
-                while let Some(next_char) = chars.next() {
-                    selected.push(next_char);
-
-                    if next_char == ']' {
-                        inside_brackets = false;
-                        break;
-                    }
-                    if chars.peek().is_none() {
-                        return Err(FormatParseError::MissingRightBracket);
-                    }
-                }
-            } else if char == ':' && !split && !inside_brackets {
-                split = true;
-                selected = &mut right;
-            } else {
-                selected.push(char);
-            }
-        }
-
+        let parts: Vec<&str> = text.splitn(2, ':').collect();
         // before the comma is a keyword or arg index, after the comma is maybe a spec.
-        let arg_part: &str = &left;
+        let arg_part = parts[0];
 
-        let format_spec = if split { right } else { String::new() };
+        let format_spec = if parts.len() > 1 {
+            parts[1].to_owned()
+        } else {
+            String::new()
+        };
 
-        // left can still be the conversion (!r, !s, !a)
+        // On parts[0] can still be the conversion (!r, !s, !a)
         let parts: Vec<&str> = arg_part.splitn(2, '!').collect();
         // before the bang is a keyword or arg index, after the comma is maybe a conversion spec.
         let arg_part = parts[0];
@@ -1197,34 +1168,6 @@ mod tests {
         );
     }
 
-    #[test]
-    fn test_square_brackets_inside_format() {
-        assert_eq!(
-            FormatString::from_str("{[:123]}"),
-            Ok(FormatString {
-                format_parts: vec![FormatPart::Field {
-                    field_name: "[:123]".to_owned(),
-                    conversion_spec: None,
-                    format_spec: "".to_owned(),
-                }],
-            }),
-        );
-
-        assert_eq!(FormatString::from_str("{asdf[:123]asdf}"), {
-            Ok(FormatString {
-                format_parts: vec![FormatPart::Field {
-                    field_name: "asdf[:123]asdf".to_owned(),
-                    conversion_spec: None,
-                    format_spec: "".to_owned(),
-                }],
-            })
-        });
-
-        assert_eq!(FormatString::from_str("{[1234}"), {
-            Err(FormatParseError::MissingRightBracket)
-        });
-    }
-
     #[test]
     fn test_format_parse_escape() {
         let expected = Ok(FormatString {
diff --git a/literal/src/escape.rs b/literal/src/escape.rs
index ba8e3ec..ee4fae5 100644
--- a/literal/src/escape.rs
+++ b/literal/src/escape.rs
@@ -232,7 +232,7 @@ impl UnicodeEscape<'_> {
     }
 }
 
-impl Escape for UnicodeEscape<'_> {
+impl<'a> Escape for UnicodeEscape<'a> {
     fn source_len(&self) -> usize {
         self.source.len()
     }
@@ -254,6 +254,24 @@ impl Escape for UnicodeEscape<'_> {
     }
 }
 
+#[cfg(test)]
+mod unicode_escape_tests {
+    use super::*;
+
+    #[test]
+    fn changed() {
+        fn test(s: &str) -> bool {
+            UnicodeEscape::new_repr(s).changed()
+        }
+        assert!(!test("hello"));
+        assert!(!test("'hello'"));
+        assert!(!test("\"hello\""));
+
+        assert!(test("'\"hello"));
+        assert!(test("hello\n"));
+    }
+}
+
 pub struct AsciiEscape<'a> {
     source: &'a [u8],
     layout: EscapeLayout,
@@ -373,7 +391,7 @@ impl AsciiEscape<'_> {
     }
 }
 
-impl Escape for AsciiEscape<'_> {
+impl<'a> Escape for AsciiEscape<'a> {
     fn source_len(&self) -> usize {
         self.source.len()
     }
@@ -421,21 +439,3 @@ impl std::fmt::Display for BytesRepr<'_, '_> {
         self.write(formatter)
     }
 }
-
-#[cfg(test)]
-mod unicode_escape_tests {
-    use super::*;
-
-    #[test]
-    fn changed() {
-        fn test(s: &str) -> bool {
-            UnicodeEscape::new_repr(s).changed()
-        }
-        assert!(!test("hello"));
-        assert!(!test("'hello'"));
-        assert!(!test("\"hello\""));
-
-        assert!(test("'\"hello"));
-        assert!(test("hello\n"));
-    }
-}
diff --git a/literal/src/float.rs b/literal/src/float.rs
index 0f10a6a..5c14fcb 100644
--- a/literal/src/float.rs
+++ b/literal/src/float.rs
@@ -6,33 +6,6 @@ pub fn parse_str(literal: &str) -> Option<f64> {
     parse_inner(literal.trim().as_bytes())
 }
 
-fn strip_underlines(literal: &[u8]) -> Option<Vec<u8>> {
-    let mut prev = b'\0';
-    let mut dup = Vec::<u8>::new();
-    for p in literal {
-        if *p == b'_' {
-            // Underscores are only allowed after digits.
-            if !prev.is_ascii_digit() {
-                return None;
-            }
-        } else {
-            dup.push(*p);
-            // Underscores are only allowed before digits.
-            if prev == b'_' && !p.is_ascii_digit() {
-                return None;
-            }
-        }
-        prev = *p;
-    }
-
-    // Underscores are not allowed at the end.
-    if prev == b'_' {
-        return None;
-    }
-
-    Some(dup)
-}
-
 pub fn parse_bytes(literal: &[u8]) -> Option<f64> {
     parse_inner(trim_slice(literal, |b| b.is_ascii_whitespace()))
 }
@@ -42,10 +15,10 @@ fn trim_slice<T>(v: &[T], mut trim: impl FnMut(&T) -> bool) -> &[T] {
     // it.take_while_ref(&mut trim).for_each(drop);
     // hmm.. `&mut slice::Iter<_>` is not `Clone`
     // it.by_ref().rev().take_while_ref(&mut trim).for_each(drop);
-    while it.clone().next().is_some_and(&mut trim) {
+    while it.clone().next().map_or(false, &mut trim) {
         it.next();
     }
-    while it.clone().next_back().is_some_and(&mut trim) {
+    while it.clone().next_back().map_or(false, &mut trim) {
         it.next_back();
     }
     it.as_slice()
@@ -55,16 +28,11 @@ fn parse_inner(literal: &[u8]) -> Option<f64> {
     use lexical_parse_float::{
         format::PYTHON3_LITERAL, FromLexicalWithOptions, NumberFormatBuilder, Options,
     };
-
-    // Use custom function for underline handling for now.
-    // For further information see https://github.com/Alexhuszagh/rust-lexical/issues/96.
-    let stripped = strip_underlines(literal)?;
-
     // lexical-core's format::PYTHON_STRING is inaccurate
     const PYTHON_STRING: u128 = NumberFormatBuilder::rebuild(PYTHON3_LITERAL)
         .no_special(false)
         .build();
-    f64::from_lexical_with_options::<PYTHON_STRING>(&stripped, &Options::new()).ok()
+    f64::from_lexical_with_options::<PYTHON_STRING>(literal, &Options::new()).ok()
 }
 
 pub fn is_integer(v: f64) -> bool {
diff --git a/parser/src/python.lalrpop b/parser/src/python.lalrpop
index fe584d8..e1b8cbc 100644
--- a/parser/src/python.lalrpop
+++ b/parser/src/python.lalrpop
@@ -370,14 +370,13 @@ MatchStatement: ast::Stmt = {
             .last()
             .unwrap()
             .end();
-        let subject_range = (subjects.first().unwrap().start()..subjects.last().unwrap().end()).into();
         ast::Stmt::Match(
             ast::StmtMatch {
                 subject: Box::new(ast::Expr::Tuple(
                     ast::ExprTuple {
                         elts: subjects,
                         ctx: ast::ExprContext::Load,
-                        range: subject_range,
+                        range: (location..end_location).into()
                     },
                 )),
                 cases,
diff --git a/parser/src/python.rs b/parser/src/python.rs
index ab02fdb..369499a 100644
--- a/parser/src/python.rs
+++ b/parser/src/python.rs
@@ -1,5 +1,5 @@
 // auto-generated: "lalrpop 0.20.0"
-// sha3: c2ba3f0f3de013733a18ba664f36f7f587254cc430656e553ceada96d33c409b
+// sha3: de5ffc51d44962eb297cbbf668fae33652eed69586405ebef2229fc02d183bc8
 use crate::{
     ast::{self as ast, Ranged, bigint::BigInt},
     lexer::{LexicalError, LexicalErrorType},
@@ -30842,14 +30842,13 @@ fn __action82<
             .last()
             .unwrap()
             .end();
-        let subject_range = (subjects.first().unwrap().start()..subjects.last().unwrap().end()).into();
         ast::Stmt::Match(
             ast::StmtMatch {
                 subject: Box::new(ast::Expr::Tuple(
                     ast::ExprTuple {
                         elts: subjects,
                         ctx: ast::ExprContext::Load,
-                        range: subject_range,
+                        range: (location..end_location).into()
                     },
                 )),
                 cases,
diff --git a/parser/src/snapshots/rustpython_parser__parser__tests__patma.snap b/parser/src/snapshots/rustpython_parser__parser__tests__patma.snap
index 65eed26..7b3b577 100644
--- a/parser/src/snapshots/rustpython_parser__parser__tests__patma.snap
+++ b/parser/src/snapshots/rustpython_parser__parser__tests__patma.snap
@@ -3783,7 +3783,7 @@ expression: parse_ast
             range: 2720..2760,
             subject: Tuple(
                 ExprTuple {
-                    range: 2726..2730,
+                    range: 2720..2760,
                     elts: [
                         Name(
                             ExprName {
diff --git a/parser/src/soft_keywords.rs b/parser/src/soft_keywords.rs
index 3f8c24c..9abcd39 100644
--- a/parser/src/soft_keywords.rs
+++ b/parser/src/soft_keywords.rs
@@ -132,8 +132,8 @@ where
             }
         }
 
-        self.start_of_line = next.as_ref().is_some_and(|lex_result| {
-            lex_result.as_ref().is_ok_and(|(tok, _)| {
+        self.start_of_line = next.as_ref().map_or(false, |lex_result| {
+            lex_result.as_ref().map_or(false, |(tok, _)| {
                 #[cfg(feature = "full-lexer")]
                 if matches!(tok, Tok::NonLogicalNewline | Tok::Comment { .. }) {
                     return self.start_of_line;
diff --git a/vendored/src/text_size/mod.rs b/vendored/src/text_size/mod.rs
index c6a240f..977038a 100644
--- a/vendored/src/text_size/mod.rs
+++ b/vendored/src/text_size/mod.rs
@@ -23,6 +23,8 @@ mod range;
 mod size;
 mod traits;
 
+#[cfg(feature = "schemars")]
+mod schemars_impls;
 #[cfg(feature = "serde")]
 mod serde_impls;
 
diff --git a/vendored/src/text_size/size.rs b/vendored/src/text_size/size.rs
index 147eab2..27a0f12 100644
--- a/vendored/src/text_size/size.rs
+++ b/vendored/src/text_size/size.rs
@@ -5,6 +5,7 @@ use {
         fmt, iter,
         num::TryFromIntError,
         ops::{Add, AddAssign, Sub, SubAssign},
+        u32,
     },
 };