sessionStartMs changed type

What changed

Parse failure, or silent coercion depending on your client.

Affects workers-observability_agent_session reachable from 1 operation.

number → integer

Who is affected

Code that reads Cloudflare's workers-observability_agent_session objects, used by 1 Cloudflare operation.

Before and after

Code that breaks

// payload.sessionStartMs
// was: number
// now: integer

Based on Cloudflare’s published API specification. How severity is decided.