NSRunLoop defines the following run loop mode.
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Additional run loop modes are defined by NSConnection and NSApplication, including the following:
static let `default`: RunLoop.Mode
The mode to deal with input sources other than NSConnection objects.
static let common: RunLoop.Mode
Objects added to a run loop using this value as the mode are monitored by all run loop modes that have been declared as a member of the set of “common" modes; see the description of CFRunLoopAddCommonMode(_:_:) for details.