This issue is for planning and discussion of features and fixes that will go into Hamcrest v3.1

Included:

• Derive version from git #419
• Javadoc cleanup #420
• java.util.Optional matchers #421
• Allow matching against polymorphic collections #422
• Implement matchers for thrown exceptions in Runnable #423
• Migrate all tests to JUnit Jupiter #424

Candidates:

• Clarify difference between Matchers and CoreMatchers
• Add JVM compatibility table
• Publish to Maven Central using GitHub Actions #416
• Java 8 Supporting Language Features #206
• IsUnmodifiableCollection matcher feature #249, fix for JDK 17 #381
• GraalVM Native Image support #403
• Add file content matcher to FileMatchers #345

See also:

• Hamcrest v4.0 #418