https://openjdk.org/projects/jdk/27/ Features 523: Make G1 the Default Garbage Collector in All Environments 527: Post-Quantum Hybrid Key Exchange for TLS 1.3 531: Lazy Constants (Third Preview) 532: Primitive Types in Patterns, instanceof, and switch (Fifth Preview) 533: Structured Concurrency (Seventh Preview) 534: Compact Object Headers by Default 536: JFR In-Process Data Redaction 537: Vector API (Twelfth Incubator) 538: PEM Encodings of Cryptographic Objects (Third Preview)