Open generic function
Finds the type of file-stream class that needs to be instantiated for a given file.
type-for-file-stream filename element-type #rest #all-keys
=> file-stream-type
<object>.
<byte-character>, <unicode-character>, or <byte>, or #f.
<type>.
io
streams
Returns the kind of file-stream class to instantiate for a given file. The method for make on <file-stream> calls this function to determine the class of which it should create an instance.