Who is described by “wa-kāna muttahaman” in report 86?

The Necessity and Boundaries of Narrator Criticism

• It is an unverified self-assessment quoted from Yaḥyā b. Maʿīn
• Shuraḥbīl b. Saʿd
• It refers to an error in al-Faḍl b. Sahl’s own transcription
• It is a criticism of an unnamed corroborator of Ḥajjāj