fix: can resolve package with version prefixed with v

src/index.ts

@@ -97,7 +97,7 @@ async function resolveNpm (
     let version: string | undefined
     switch (spec.type) {
       case 'version':
-        version = spec.fetchSpec
+        version = semver.clean(spec.fetchSpec) as string
         break
       case 'tag':
         version = meta['dist-tags'][spec.fetchSpec]

src/parsePref.ts

@@ -18,6 +18,7 @@ export default function parsePref (pref: string, alias?: string): RegistryPackag
   if (!name) {
     return null
   }
+  // TODO: this should also return the clean version of the spec (what semver.valid returns)
   const type = getVersionSelectorType(pref, true)
   if (type) {
     return {