[Bug] hs_persist_state silently ignores function names

[lepeuvedic]

Summary

Passing a function name to hs_persist_state produces an empty state string with no warning.

Current behavior

• Functions are silently ignored.
• Callers cannot detect misuse when a function name is accidentally passed.

Expected behavior

• Detect function names and fail with a clear error (or emit a warning).

Severity

Medium.