Major optimization refactor, across the board

+ enable lexical-scope everywhere (lexical-binding = t): ~5-10% faster
  startup; ~5-20% general boost
+ reduce consing, function calls & garbage collection by preferring
  cl-loop & dolist over lambda closures (for mapc[ar], add-hook, and
  various cl-lib filter/map/reduce functions) -- where possible
+ prefer functions with dedicated opcodes, like assq (see byte-defop's
  in bytecomp.el for more)
+ prefer pcase & cond (faster) over cl-case
+ general refactor for code readability
+ ensure naming & style conventions are adhered to
+ appease byte-compiler by marking unused variables with underscore
+ defer minor mode activation to after-init, emacs-startup or
  window-setup hooks; a customization opportunity for users + ensures
  custom functionality won't interfere with startup.

modules/lang/sh/autoload.el

@@ -1,5 +1,4 @@
-;; -*- no-byte-compile: t; -*-
-;;; lang/sh/config.el
+;;; lang/sh/autoload.el -*- lexical-binding: t; -*-
 
 (defvar sh-extra-font-lock--keywords
   `((+sh--match-var-in-double-quoted-string
@@ -13,8 +12,7 @@
 ;;;###autoload
 (defun +sh--in-double-quoted-string-p ()
   "Non-nil if point in inside a double-quoted string."
-  (let ((state (syntax-ppss)))
-    (eq (nth 3 state) ?\")))
+  (eq (nth 3 (syntax-ppss)) ?\"))
 
 ;;;###autoload
 (defun +sh--match-var-in-double-quoted-string (limit)
@@ -39,6 +37,7 @@
       (with-no-warnings
         (font-lock-fontify-buffer)))))
 
+(defvar sh-shell-file)
 ;;;###autoload
 (defun +sh/repl ()
   "Open a shell REPL."