`tramp-rpc-file-name-p` defined twice

`tramp-rpc-file-name-p` is defined twice. First as a [defsubst](https://github.com/ArthurHeymans/emacs-tramp-rpc/blob/master/lisp/tramp-rpc.el#L100) and then again as a [defun](https://github.com/ArthurHeymans/emacs-tramp-rpc/blob/master/lisp/tramp-rpc.el#L2720). Is this intentional?