message: fix: avoid unnecessary lowercase coersion in component name validation
  close
diff: @@ -260,8 +260,7 @@ export function validateComponentName (name: string) {
  'and must start with a letter.'
  )
  }
  - const lower = name.toLowerCase()
  - if (isBuiltInTag(lower) || config.isReservedTag(lower)) {
  + if (isBuiltInTag(name) || config.isReservedTag(name)) {
  warn(
  'Do not use built-in or reserved HTML elements as component ' +
  'id: ' + name
  