Predefined Contracts

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Any

typeOfNumber
typeOfString
typeOfBoolean
typeOfObject
typeOfFunction
typeOfUndefined

instanceOfTarget
instanceOfObject
instanceOfFunction
instanceOfArray
instanceOfBoolean
instanceOfDate
instanceOfIterator
instanceOfNumber
instanceOfString
instanceOfRegExp
instanceOfError

isNaN
isUndefined
isNull
isTrue
isFalse
isPrimitiveValue
isNativeFunction