Read this slot's value for the current invocation. Returns the
value previously set during this invocation, or the default
passed to contextLocal (or undefined if none) when it has
not been set. Must be called from generator code on the fiber's
synchronous span (a gen body running under execute); calling it
from an ops.run closure or other async callback throws.
Set this slot's value for the rest of the current invocation,
visible to every fiber under it. Must be called from generator code
on the fiber's synchronous span; calling it from an ops.run
closure or other async callback throws.
A handle to one invocation-scoped slot. Mint it once with contextLocal (at module scope is fine — minting touches no fiber), then
get/setit from inside the workflow body.