Variables
Const DEFAULT_EPS
DEFAULT_EPS: 0.000001 = 0.000001
Const EVENT_ALL
EVENT_ALL: "*" = "*"
Const EVENT_DISABLE
EVENT_DISABLE: "disable" = "disable"
Const EVENT_ENABLE
EVENT_ENABLE: "enable" = "enable"
Const SEMAPHORE
SEMAPHORE: unique symbol = Symbol()
Catch-all event ID