Format str constructor fast path

Copilot · youknowone · Copilot · commit a555ce4c8eea · 2026-03-17T11:29:34.000Z
Co-authored-by: youknowone &lt;69878+youknowone@users.noreply.github.com&gt;
diff --git a/crates/vm/src/builtins/str.rs b/crates/vm/src/builtins/str.rs
@@ -395,9 +395,7 @@ impl Constructor for PyStr {
 
     fn slot_new(cls: PyTypeRef, func_args: FuncArgs, vm: &VirtualMachine) -> PyResult {
         // Optimization: for exact str, return PyObject_Str result as-is
-        if cls.is(vm.ctx.types.str_type)
-            && func_args.args.len() == 1
-            && func_args.kwargs.is_empty()
+        if cls.is(vm.ctx.types.str_type) && func_args.args.len() == 1 && func_args.kwargs.is_empty()
         {
             return func_args.args[0].str(vm).map(Into::into);
         }

Original file line number	Diff line number	Diff line change
`@@ -395,9 +395,7 @@ impl Constructor for PyStr {`
`395`	`395`
`396`	`396`	`fn slot_new(cls: PyTypeRef, func_args: FuncArgs, vm: &VirtualMachine) -> PyResult {`
`397`	`397`	`// Optimization: for exact str, return PyObject_Str result as-is`
`398`		`- if cls.is(vm.ctx.types.str_type)`
`399`		`- && func_args.args.len() == 1`
`400`		`- && func_args.kwargs.is_empty()`
	`398`	`+ if cls.is(vm.ctx.types.str_type) && func_args.args.len() == 1 && func_args.kwargs.is_empty()`
`401`	`399`	`{`
`402`	`400`	`return func_args.args[0].str(vm).map(Into::into);`
`403`	`401`	`}`