fix windows?

Author: isaacs

lib/index.js

@@ -558,7 +558,7 @@ class Config {
     // up loading the "project" config where the "userconfig" will be,
     // which causes some calamaties.  So, we only load project config if
     // it doesn't match what the userconfig will be.
-    if (projectFile === this[_get]('userconfig')) {
+    if (this[_get]('userconfig') && relative(projectFile, this[_get]('userconfig')) === '') {
       this.localPrefix = projectDir
       this.data.get('project').source = '(project same as "user" config, ignored)'
       this.sources.set(this.data.get('project').source, 'project')

test/index.js

@@ -960,6 +960,10 @@ t.test('workspace-root settings', async t => {
     },
     definitions: {
       registry: { default: registry },
+      'workspace-root': {
+        default: undefined,
+        type: require('path'),
+      },
       workspace: {
         default: [],
         type: [Array, String],