Clean up some lint

autoload/matchup/delim.vim

@@ -594,7 +594,7 @@ function! s:parser_delim_new(lnum, cnum, opts) " {{{1
       " handle syntax check- currently used for 'same' matches
       if has_key(l:extra_entry, 'syn')
         let l:pat = l:extra_entry.syn
-        if l:pat[0] == '!'
+        if l:pat[0] ==? '!'
           let l:pat = l:pat[1:]
           if matchup#util#in_synstack(l:pat, a:lnum, a:cnum)
             continue

autoload/matchup/perf.vim

@@ -51,7 +51,7 @@ function! matchup#perf#show_times()
   end
 
   echohl Title
-  echo printf("%42s%11s%17s", 'average', 'last', 'maximum')
+  echo printf('%42s%11s%17s', 'average', 'last', 'maximum')
   echohl None
   for l:c in l:contexts
     echohl Special
@@ -60,7 +60,7 @@ function! matchup#perf#show_times()
     let l:states = filter(copy(l:keys), 'v:val =~# "^\\V'.l:c.'#"')
     call sort(l:states, 's:sort_by_last')
     for l:s in l:states
-      echo printf("  %-25s%12.2gms%12.2gms%12.2gms",
+      echo printf('  %-25s%12.2gms%12.2gms%12.2gms',
             \ join(split(l:s,'#')[1:],'#'),
             \ 1000*g:matchup#perf#times[l:s].emavg,
             \ 1000*g:matchup#perf#times[l:s].last,

autoload/matchup/quirks.vim

@@ -52,11 +52,11 @@ function! matchup#quirks#status_adjust(offscreen) abort " {{{1
     " go up to next line with same indent (up to s:adjust_max)
     for l:adjust in range(-1, -s:adjust_max, -1)
       let l:lnum = a:offscreen.lnum + l:adjust
-      if getline(l:lnum) =~ '^\s*$'
+      if getline(l:lnum) =~? '^\s*$'
         break
       endif
       if indent(l:lnum) == l:target
-            \ && getline(l:lnum) !~ '^\s*\%(#\|/\*\|//\)'
+            \ && getline(l:lnum) !~? '^\s*\%(#\|/\*\|//\)'
         return l:adjust
       endif
     endfor