Accessing array slices fails for non-lowercase keys

[awrichar]

Preflight Checklist

• I have searched the issue tracker for an issue that matches the one I want to file, without success.
• I am not looking for support or already pursued the available support channels without success.
• I have checked the troubleshooting guide for my problem, without success.

Viper Version

master

Go Version

1.17.9

Config Source

Files

Format

YAML

Repl.it link

No response

Code reproducing the issue

diff --git a/viper_test.go b/viper_test.go
index c41a1e7..536a53d 100644
--- a/viper_test.go
+++ b/viper_test.go
@@ -2517,6 +2517,7 @@ func TestKeyDelimiter(t *testing.T) {
 
 var yamlDeepNestedSlices = []byte(`TV:
 - title: "The expanse"
+  originalNetwork: "syfy"
   seasons:
   - first_released: "December 14, 2015"
     episodes:
@@ -2547,6 +2548,7 @@ func TestSliceIndexAccess(t *testing.T) {
        require.NoError(t, err)
 
        assert.Equal(t, "The expanse", v.GetString("tv.0.title"))
+       assert.Equal(t, "syfy", v.GetString("tv.0.originalNetwork"))
        assert.Equal(t, "February 1, 2017", v.GetString("tv.0.seasons.1.first_released"))
        assert.Equal(t, "Static", v.GetString("tv.0.seasons.1.episodes.2.title"))
        assert.Equal(t, "December 15, 2015", v.GetString("tv.0.seasons.0.episodes.1.air_date"))

Expected Behavior

If my config contains an array, and one of the sub-keys in that array is non-lowercase (ie contains one or more capital letters), Viper is unable to retrieve the key using slice notation.

I modified a simple unit test to contain this array element:

- title: "The expanse"
  originalNetwork: "syfy"

When accessing the value with v.GetString("tv.0.originalNetwork"), I expect to receive the value "syfy".

Actual Behavior

An empty string is returned.

Steps To Reproduce

No response

Additional Information

No response

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[awrichar]

For the record: it looks like this support was originally added in #861, so it's possible something was missed there.