When processing ansi-color.el, e.g.

(elsa-process-file "/opt/homebrew/Cellar/emacs-mac/emacs-29.1-mac-10.0/share/emacs/29.1/lisp/ansi-color.el.gz")

A bool vector #&8"\0" at line 975 is not recognized, leading to an error "Invalid form" is thrown

It seems that bool-vector-p can be used to check whether it's a bool vector, and the corresponding type does exist in Elsa:

However, I lack the knowledge to add the elsa-form- class and the reader for it.