ReadonlybuiltInPrefix: "built-in:"Checks if a given node id is a built-in function or operator id by checking if it is a string that starts with the built-in prefix.
Converts a built-in function or operator name or id to a built-in id by prefixing it with the built-in prefix if it is not already a built-in id. This allows us to accept both built-in names and ids in contexts where we want to work with built-in ids.
Readonlyname: "NodeId"Converts a built-in function or operator name to a built-in id by prefixing it with the built-in prefix.
Inverse of fromPkgFn: split a package-function built-in id (built-in:pkg:fn) into its [pkg, fn]
parts, or undefined when id is not one (a non-builtin id, or a bare builtin without a package such as
built-in:print). A package name never contains a :, so the first one separates it from the function.
The prefix used for built-in function or operator ids.