Ben's comments

CHANGELOG.md

@@ -1,7 +1,7 @@
 ## 1.7.0
 
 - Require Dart 3.0.0
-- Update `package:vm_service` constraints to '>=12.0.0 <13.0.0'.
+- Update `package:vm_service` constraints to '^12.0.0'.
 - Add `coverableLineCache` parameter to `collect`. This allows the set of
   coverable lines to be cached between calls to `collect`, avoiding the need to
   force compile the same libraries repeatedly. This is only useful when running

lib/src/collect.dart

@@ -372,10 +372,8 @@ Future<List<Map<String, dynamic>>> _processSourceReport(
     // the lines that don't have a hit. Afterwards, add all the lines that were
     // hit or missed to the cache, so that the next coverage collection won't
     // need to compile this libarry.
-    Set<int>? coverableLines;
-    if (coverableLineCache != null) {
-      coverableLines = coverableLineCache[scriptUriString] ??= <int>{};
-    }
+    final coverableLines =
+        coverableLineCache?.putIfAbsent(scriptUriString, () => <int>{});
 
     // Not returned in scripts section of source report.
     if (scriptUri.scheme == 'evaluate') continue;

pubspec.yaml

@@ -4,7 +4,7 @@ description: Coverage data manipulation and formatting
 repository: https://github.com/dart-lang/coverage
 
 environment:
-  sdk: '>=3.0.0 <4.0.0'
+  sdk: '^3.0.0'
 
 dependencies:
   args: ^2.0.0
@@ -13,7 +13,7 @@ dependencies:
   path: ^1.8.0
   source_maps: ^0.10.10
   stack_trace: ^1.10.0
-  vm_service: '>=12.0.0 <13.0.0'
+  vm_service: '^12.0.0'
 
 dev_dependencies:
   benchmark_harness: ^2.2.0