GitHub Actions Reusable Workflow Vars Silently Coerce to Empty Strings
When a caller workflow passes a repository-level variable (vars.X) to a reusable workflow input, GitHub silently coerces it to an empty string and throws a cryptic evaluation error. The documented limitation only covers secrets, not vars, leaving DevOps engineers without a clear fix path. This undocumented behavior blocks adoption of reusable workflows at scale.
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Problem descriptions, scores, analysis, and solution blueprints may be updated as new community data becomes available.