1. 8ec04ce cancel: Fix passing nullopt to constructor by William A. Kennington III · 3 years, 7 months ago
  2. 20cab0c cancel: Add utility for always running callback by William A. Kennington III · 3 years, 7 months ago
  3. 458aeae cancel: Add cancelable utility by William A. Kennington III · 3 years, 7 months ago