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Fixed in #1429

Whilst this appears to have fixed things for "Unmarshal", it doesn't appear to have fixed things for "Unmarshalkey". Naively I expect that Unmarshalkey to be consistent with Unmarshal. That is, the following test fails (added as part of TestUnmarshalWithAutomaticEnv:

        t.Run("Subkey", func(t *testing.T) {
            var config StorageConfig

		if err := v.UnmarshalKey("filesystem", &config); err != nil {
			t.Fatalf("unable to decode into struct, %v", err)
		}

		assert.Equal(
			t,
			StorageConfig{
				Size: 4096,
			},
			config,
		)
	})