Dr Jekyll and Mr Hyde’s Feature Flags

Progressive Delivery and the Divided Self

Robert Louis Stevenson · 17 June 2026

“Man is not truly one, but truly two; likewise, every feature has at least two deployment states.”

A gothic investigation into progressive delivery, dark launches, rollback discipline, and the terrifying discovery that every production system contains impulses it would rather conceal.

Contents

1. Chapter 1: The Respectable Toggle
2. Chapter 2: Mr Hyde Enables Production
3. Chapter 3: Experiments Conducted After Midnight
4. Chapter 4: Rollback Comes Too Late

Published by Austenpunk, the distinguished imprint for engineers who believe that every production incident would be improved by a stronger sense of narrative irony.

This essential volume combines literary feeling, technical anxiety, and just enough documentation to suggest that somebody once understood the system.