Readonlyfoldswhether the value solver can fold a call of this built-in to a constant
Readonlynamethe identifier the built-in is registered under, with a replacement's suffix spelled out
Optional Readonlypropsthe CallProp bits the definition states, undefined when it states none
Optional Readonlysigthe declared parameters and what each of their arguments is used for
One built-in as the BuiltInIndex sees it: the name it is registered under and what flowR states about it.