fix: remove the trailing slash of paths in isSameURL (#542)

Author: ElmerZhang

lib/core/utilities.js

@@ -1,7 +1,7 @@
 export const isUnset = o => typeof o === 'undefined' || o === null
 export const isSet = o => !isUnset(o)
 
-export const isSameURL = (a, b) => a.split('?')[0] === b.split('?')[0]
+export const isSameURL = (a, b) => a.split('?')[0].replace(/\/+$/, '') === b.split('?')[0].replace(/\/+$/, '')
 
 export const isRelativeURL = u =>
   u && u.length && /^\/([a-zA-Z0-9@\-%_~][/a-zA-Z0-9@\-%_~]*)?([?][^#]*)?(#[^#]*)?$/.test(u)