fix: avoid unnecessary lowercase coersion in component name validation

yyx990803 · lovelope · commit b72f5cdad1a2 · 2018-02-01T11:38:15.000+08:00
close vuejs#7237
diff --git a/src/core/util/options.js b/src/core/util/options.js
@@ -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

Original file line number	Diff line number	Diff line change
`@@ -260,8 +260,7 @@ export function validateComponentName (name: string) {`
`260`	`260`	`'and must start with a letter.'`
`261`	`261`	`)`
`262`	`262`	`}`
`263`		`- const lower = name.toLowerCase()`
`264`		`- if (isBuiltInTag(lower) \|\| config.isReservedTag(lower)) {`
	`263`	`+ if (isBuiltInTag(name) \|\| config.isReservedTag(name)) {`
`265`	`264`	`warn(`
`266`	`265`	`'Do not use built-in or reserved HTML elements as component ' +`
`267`	`266`	`'id: ' + name`