Revert "change config methods to use lowercase keys"

This reverts commit 9671e62.

Author: epage

src/config.rs

@@ -110,8 +110,7 @@ impl Config {
     where
         T: Into<Value>,
     {
-        self.defaults
-            .insert(key.to_lowercase().as_str().parse()?, value.into());
+        self.defaults.insert(key.parse()?, value.into());
 
         #[allow(deprecated)]
         self.refresh()
@@ -130,16 +129,15 @@ impl Config {
     where
         T: Into<Value>,
     {
-        self.overrides
-            .insert(key.to_lowercase().as_str().parse()?, value.into());
+        self.overrides.insert(key.parse()?, value.into());
 
         #[allow(deprecated)]
         self.refresh()
     }
 
     #[deprecated(since = "0.12.0", note = "please use 'ConfigBuilder' instead")]
     pub fn set_once(&mut self, key: &str, value: Value) -> Result<()> {
-        let expr: path::Expression = key.to_lowercase().as_str().parse()?;
+        let expr: path::Expression = key.parse()?;
 
         // Traverse the cache using the path to (possibly) retrieve a value
         if let Some(ref mut val) = expr.get_mut(&mut self.cache) {
@@ -151,8 +149,6 @@ impl Config {
     }
 
     fn get_value(&self, key: &str) -> Result<Value> {
-        let k = key.to_lowercase();
-        let key = k.as_str();
         // Parse the key into a path expression
         let expr: path::Expression = key.parse()?;
 

tests/testsuite/case.rs

@@ -74,5 +74,5 @@ fn respect_path_case() {
         .build()
         .unwrap();
 
-    c.get_string("Student[0].Name").unwrap_err();
+    c.get_string("Student[0].Name").unwrap();
 }

tests/testsuite/set.rs

@@ -116,6 +116,6 @@ fn test_set_capital() {
         .unwrap();
 
     assert_eq!(config.get::<bool>("this").unwrap(), false);
-    config.get::<bool>("ThAt").unwrap_err();
-    config.get::<usize>("logLevel").unwrap_err();
+    assert_eq!(config.get::<bool>("ThAt").unwrap(), true);
+    assert_eq!(config.get::<usize>("logLevel").unwrap(), 5);
 }