Represents a callback token for persistent function references.
Callbacks enable tools and twists to create persistent references to functions
that can survive worker restarts and be invoked across different execution contexts.
This is a branded string type to prevent mixing callback tokens with regular strings.
Represents a callback token for persistent function references.
Callbacks enable tools and twists to create persistent references to functions that can survive worker restarts and be invoked across different execution contexts.
This is a branded string type to prevent mixing callback tokens with regular strings.