Function
An instance to be matched. If null, any context will be examined. Otherwise the context should belong to this instance.
An optional pattern to be matched against a method name. Can be a string, a RegExp object or an array of strings and RegExp objects. If it is omitted, any name will satisfy the criteria.
Returns true if the context stack contains a context for a given instance that satisfies a given method name criteria.
Boolean
Object
Object
Object