perf(uinput): cache spec on device creation

Author: haithium

src/evdev/uinput.lua

@@ -220,11 +220,21 @@ end
 local M = {}
 
 function M.create(spec)
-  local ui, err = create_uinput(normalize(spec))
+  spec = normalize(spec)
+
+  local ui, err = create_uinput(spec)
   if not ui then
     return nil, err
   end
-  return setmetatable({ _core = ui }, UInput)
+
+  local uinput = { _core = ui }
+  for k in pairs(defaults) do
+    if k ~= "path" then
+      uinput[k] = spec[k]
+    end
+  end
+
+  return setmetatable(uinput, UInput)
 end
 
 ---@diagnostic disable-next-line: undefined-global