partially revert 'Added features that allow the reader to accept common non-standard JSON.'

revert '642befc836ac5093b528e7d8b4fd66b66735a98c',
but keep the *added* methods for `decodedNumber()` and `decodedDouble()`.

Author: cdunn2001

Diff for: include/json/features.h

@@ -44,12 +44,6 @@ class JSON_API Features {
   /// \c true if root must be either an array or an object value. Default: \c
   /// false.
   bool strictRoot_;
-
-  /// \c true if dropped null placeholders are allowed. Default: \c false.
-  bool allowDroppedNullPlaceholders_;
-
-  /// \c true if numeric object key are allowed. Default: \c false.
-  bool allowNumericKeys_;
 };
 
 } // namespace Json

Diff for: src/lib_json/json_reader.cpp

@@ -42,17 +42,14 @@ typedef std::auto_ptr<CharReader>   CharReaderPtr;
 // ////////////////////////////////
 
 Features::Features()
-    : allowComments_(true), strictRoot_(false),
-      allowDroppedNullPlaceholders_(false), allowNumericKeys_(false) {}
-
+    : allowComments_(true), strictRoot_(false)
+{}
 Features Features::all() { return Features(); }
 
 Features Features::strictMode() {
   Features features;
   features.allowComments_ = false;
   features.strictRoot_ = true;
-  features.allowDroppedNullPlaceholders_ = false;
-  features.allowNumericKeys_ = false;
   return features;
 }
 
@@ -190,17 +187,7 @@ bool Reader::readValue() {
     currentValue().swapPayload(v);
     }
     break;
-  case tokenArraySeparator:
-  case tokenObjectEnd:
-  case tokenArrayEnd:
-    if (features_.allowDroppedNullPlaceholders_) {
-      // "Un-read" the current token and mark the current value as a null
-      // token.
-      current_--;
-      Value v;
-      currentValue().swapPayload(v);
-      break;
-    } // Else, fall through...
+  // Else, fall through...
   default:
     return addError("Syntax error: value, object or array expected.", token);
   }
@@ -446,11 +433,6 @@ bool Reader::readObject(Token& /*tokenStart*/) {
     if (tokenName.type_ == tokenString) {
       if (!decodeString(tokenName, name))
         return recoverFromError(tokenObjectEnd);
-    } else if (tokenName.type_ == tokenNumber && features_.allowNumericKeys_) {
-      Value numberName;
-      if (!decodeNumber(tokenName, numberName))
-        return recoverFromError(tokenObjectEnd);
-      name = numberName.asString();
     } else {
       break;
     }