Why a Hugo builder encounters Go
Hugo is implemented in Go. Reading a focused source path can explain a behavior that template experiments alone leave unclear. Go templates are not unrestricted Go programs: understand the API available in the rendering environment.
With AI assistance
Use AI to propose a reading map, explain types, or generate a minimal reproduction. Verify that the referenced symbols exist in the pinned source revision. An explanation of plausible internals is not evidence of the actual implementation.