Merge pull request #1 from ChrisBenua/swift-runtime-overhead-optimization

Author: vnixx

Sources/ReerJSON/JSONDecoderImpl.swift

@@ -168,7 +168,7 @@ final class JSONDecoderImpl: Decoder {
         if type == Decimal.self {
             return try unboxDecimal(from: value, for: codingPathNode, additionalKey) as! T
         }
-        if let dictType = type as? StringDecodableDictionary.Type {
+        if !options.keyDecodingStrategy.isDefault, let dictType = type as? StringDecodableDictionary.Type {
             return try unboxDictionary(from: value, as: dictType, for: codingPathNode, additionalKey)
         }
 

Sources/ReerJSON/Utilities.swift

@@ -127,6 +127,18 @@ extension Dictionary : StringDecodableDictionary where Key == String, Value: Dec
     static var elementType: Decodable.Type { return Value.self }
 }
 
+extension JSONDecoder.KeyDecodingStrategy {
+    @inline(__always)
+    var isDefault: Bool {
+        switch self {
+        case .useDefaultKeys:
+            return true
+        default:
+            return false
+        }
+    }
+}
+
 // This is a workaround for the lack of a "set value only if absent" function for Dictionary.
 extension Optional {
     mutating func _setIfNil(to value: Wrapped) {