Cloudflare Workers ↔ Durable Objects: Compatibility of lock semantics across runtime versions

Cloudflare Workers ↔ Durable Objects: Compatibility of lock semantics across runtime versions

The goal is to determine whether the DurableObject.lock method behaves consistently when invoked from Cloudflare Workers running different runtime versions (e.g., 2023.12 vs newer releases). The key uncertainty lies in whether the lock acquisition order, timeout handling, and eventual consistency guarantees are preserved when the Workers runtime version does not fully support the latest Durable Objects API (v2). This mismatch could lead to race conditions or silent degradation of lock functionality in distributed edge deployments.

Given the lack of explicit ordering guarantees in the API documentation and the history of runtime‑API version changes, the following questions remain unresolved:

• Does the lock method enforce a deterministic acquisition order when multiple Workers concurrently request the same lock on a Durable Object instance?
• How does a runtime version that predates the latest Durable Objects API handle lock timeouts and what observable differences arise compared to a fully compatible runtime?
• What best‑practice verification steps can confirm that a given Workers runtime and the Durable Objects API are in sync regarding lock semantics?