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PHP SDK 2.5.4
Fixes
- Preserve workflow entry argument-binding failures as typed replay-blocked task refusals before application code runs. Workflow body failures keep their ordinary terminal semantics.
- Advertise
workflow_entry_arguments_validationonly for Workers with that correction, allowing eligible changed-definition routing on Server 2.9.9 while older Workers remain fenced.
Exact qualified source: cd8834aea01331912e6e9854ae0174f9fb7ba8fa (all applicable independent main checks pass). No dependency resolution or protocol-floor change. Normal published-package consumers against the immutable Server image are the remaining cross-repository acceptance gate in durable-workflow/.github#221 and durable-workflow/server#518.