Allow npm namespaces to be case-sensitive

Author: PFCM

packageurl.go

@@ -566,7 +566,6 @@ func typeAdjustNamespace(purlType, ns string) string {
 		TypeDebian,
 		TypeGithub,
 		TypeGolang,
-		TypeNPM,
 		TypeRPM,
 		TypeQpkg:
 		return strings.ToLower(ns)

packageurl_test.go

@@ -515,12 +515,12 @@ func TestNormalize(t *testing.T) {
 	}, {
 		name: "known type namespace adjustments",
 		input: packageurl.PackageURL{
-			Type:      "npm",
+			Type:      "apk",
 			Namespace: "NaMeSpAcE",
 			Name:      "pkg",
 		},
 		want: packageurl.PackageURL{
-			Type:       "npm",
+			Type:       "apk",
 			Namespace:  "namespace",
 			Name:       "pkg",
 			Qualifiers: packageurl.Qualifiers{},