Revert "Fix: Force usage of case-sensitive keys in configurations (#6876

)" (#6988)

This reverts commit 8fa8408.

confmap/confmap.go

@@ -161,7 +161,6 @@ func decodeConfig(m *Conf, result interface{}, errorUnused bool) error {
 		Result:           result,
 		TagName:          "mapstructure",
 		WeaklyTypedInput: true,
-		MatchName:        caseSensitiveMatchName,
 		DecodeHook: mapstructure.ComposeDecodeHookFunc(
 			expandNilStructPointersHookFunc(),
 			mapstructure.StringToSliceHookFunc(","),
@@ -190,13 +189,6 @@ func encoderConfig(rawVal interface{}) *encoder.EncoderConfig {
 	}
 }
 
-// case-sensitive version of the callback to be used in the MatchName property
-// of the DecoderConfig. The default for MatchEqual is to use strings.EqualFold,
-// which is case-insensitive.
-func caseSensitiveMatchName(a, b string) bool {
-	return a == b
-}
-
 // In cases where a config has a mapping of something to a struct pointers
 // we want nil values to resolve to a pointer to the zero value of the
 // underlying struct just as we want nil values of a mapping of something

exporter/loggingexporter/config_test.go

@@ -74,10 +74,6 @@ func TestUnmarshalConfig(t *testing.T) {
 			filename:    "invalid_verbosity_loglevel.yaml",
 			expectedErr: "'loglevel' and 'verbosity' are incompatible. Use only 'verbosity' instead",
 		},
-		{
-			filename:    "config_loglevel_typo.yaml",
-			expectedErr: "1 error(s) decoding:\n\n* '' has invalid keys: logLevel",
-		},
 	}
 
 	for _, tt := range tests {