This coerces the given object to a function.
- If the object is already a function, it is returned as is.
- If the object is a file that can be unpacked to a function, such as a
.js,.ori, or.wasmfile, this unpacks the file and returns the default export (which is assumed to be a function). - If the object is a treelike object, the object is coerced to a tree, and the tree’s
get()method will be returned. - Otherwise, a constant function is returned that always produces the indicated object.