The below channels are used by the Spaces library internally.
Each Space (as defined by the Space class) creates its own Ably Channel.
The channel name is defined by the name of the Space and takes the form: ${name}::$space. The full name of a channel belonging to a Space called 'slides' would therefore be slides::$space.
If any member of a Space subscribes to or sets cursor updates a channel is created for cursors updates.
The channel name is defined by the name of the Space with the ::$cursors suffix, taking the form: ${space.name}::$cursors. The full name of a channel belonging to a Space called 'slides' would therefore be slides::$cursors.
cursorUpdate- a batch of cursor updates passed toset.