Answer architecture round 3: New loads only sources without an index and what they read, an entry drops reads, ErrLoad sits beside New, the manifest decoder moves to manifest.go and names each mistake once as jsonvalue.Kind words it

perf_test.go

@@ -177,7 +177,7 @@ func BenchmarkWideTokens500(b *testing.B) {
 
 // New decodes the shipped manifest and loads nothing else.
 func TestNoNewAllocRegression(t *testing.T) {
-	const base = 2501.0
+	const base = 2449.0
 	allocs := testing.AllocsPerRun(100, func() {
 		if _, err := New(WithSeed(1)); err != nil {
 			t.Fatal(err)