Assertion: function | /r/CapableOf | input the callback
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Source sentences:
text: ’s solution is not resolved statically (i.e. not at compile-time, which is why TypeScript models only the optionality and not the default values in the function’s type signature) thus incurs additional runtime overhead, although it does provide more flexibility in that callbacks can independently control their defaults instead of centrally dictated by the (callback’s type signature in the) type signature of the function which inputs the callback.