What subscribing to E emits: a union discriminated on msg.
E
msg
The arms differ in more than their payload — a removal carries an id and no fields in 55 of the 56 collections that declare one — so narrowing on msg is what makes the payload safe to reach.
id
fields
What subscribing to
Eemits: a union discriminated onmsg.The arms differ in more than their payload — a removal carries an
idand nofieldsin 55 of the 56 collections that declare one — so narrowing onmsgis what makes the payload safe to reach.