diff --git a/dist/js-yaml.js b/dist/js-yaml.js
index c050452f..87a0c994 100644
--- a/dist/js-yaml.js
+++ b/dist/js-yaml.js
@@ -1,4 +1,4 @@
-/* js-yaml 3.5.2 https://github.com/nodeca/js-yaml */(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.jsyaml = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
+/* js-yaml 3.5.3 https://github.com/nodeca/js-yaml */(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.jsyaml = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
 'use strict';
 
 
@@ -44,21 +44,19 @@ module.exports.addConstructor = deprecated('addConstructor');
 
 
 function isNothing(subject) {
-  return (typeof subject === 'undefined') || (null === subject);
+  return (typeof subject === 'undefined') || (subject === null);
 }
 
 
 function isObject(subject) {
-  return (typeof subject === 'object') && (null !== subject);
+  return (typeof subject === 'object') && (subject !== null);
 }
 
 
 function toArray(sequence) {
-  if (Array.isArray(sequence)) {
-    return sequence;
-  } else if (isNothing(sequence)) {
-    return [];
-  }
+  if (Array.isArray(sequence)) return sequence;
+  else if (isNothing(sequence)) return [];
+
   return [ sequence ];
 }
 
@@ -91,7 +89,7 @@ function repeat(string, count) {
 
 
 function isNegativeZero(number) {
-  return (0 === number) && (Number.NEGATIVE_INFINITY === 1 / number);
+  return (number === 0) && (Number.NEGATIVE_INFINITY === 1 / number);
 }
 
 
@@ -165,9 +163,7 @@ var DEPRECATED_BOOLEANS_SYNTAX = [
 function compileStyleMap(schema, map) {
   var result, keys, index, length, tag, style, type;
 
-  if (null === map) {
-    return {};
-  }
+  if (map === null) return {};
 
   result = {};
   keys = Object.keys(map);
@@ -176,7 +172,7 @@ function compileStyleMap(schema, map) {
     tag = keys[index];
     style = String(map[tag]);
 
-    if ('!!' === tag.slice(0, 2)) {
+    if (tag.slice(0, 2) === '!!') {
       tag = 'tag:yaml.org,2002:' + tag.slice(2);
     }
 
@@ -250,9 +246,9 @@ function indentString(string, spaces) {
       line = string.slice(position, next + 1);
       position = next + 1;
     }
-    if (line.length && line !== '\n') {
-      result += ind;
-    }
+
+    if (line.length && line !== '\n') result += ind;
+
     result += line;
   }
 
@@ -321,12 +317,12 @@ function writeScalar(state, object, level, iskey) {
       position, escapeSeq, hexEsc, previous, lineLength, modifier,
       trailingLineBreaks, result;
 
-  if (0 === object.length) {
+  if (object.length === 0) {
     state.dump = "''";
     return;
   }
 
-  if (-1 !== DEPRECATED_BOOLEANS_SYNTAX.indexOf(object)) {
+  if (DEPRECATED_BOOLEANS_SYNTAX.indexOf(object) !== -1) {
     state.dump = "'" + object + "'";
     return;
   }
@@ -348,9 +344,8 @@ function writeScalar(state, object, level, iskey) {
   // Can only use > and | if not wrapped in spaces or is not a key.
   // Also, don't use if in flow mode.
   if (spaceWrap || (state.flowLevel > -1 && state.flowLevel <= level)) {
-    if (spaceWrap) {
-      simple = false;
-    }
+    if (spaceWrap) simple = false;
+
     folded = false;
     literal = false;
   } else {
@@ -367,17 +362,13 @@ function writeScalar(state, object, level, iskey) {
 
   indent = state.indent * level;
   max = state.lineWidth;
-  if (max === -1) {
-    // Replace -1 with biggest ingeger number according to
-    // http://ecma262-5.com/ELS5_HTML.htm#Section_8.5
-    max = 9007199254740991;
-  }
 
-  if (indent < 40) {
-    max -= indent;
-  } else {
-    max = 40;
-  }
+  // Replace -1 with biggest ingeger number according to
+  // http://ecma262-5.com/ELS5_HTML.htm#Section_8.5
+  if (max === -1) max = 9007199254740991;
+
+  if (indent < 40) max -= indent;
+  else max = 40;
 
   for (position = 0; position < object.length; position++) {
     character = object.charCodeAt(position);
@@ -421,23 +412,17 @@ function writeScalar(state, object, level, iskey) {
       if (folded) {
         lineLength = position - linePosition;
         linePosition = position;
-        if (lineLength > longestLine) {
-          longestLine = lineLength;
-        }
+        if (lineLength > longestLine) longestLine = lineLength;
       }
     }
 
-    if (character !== CHAR_DOUBLE_QUOTE) {
-      single = false;
-    }
+    if (character !== CHAR_DOUBLE_QUOTE) single = false;
 
     double.takeUpTo(position);
     double.escapeChar();
   }
 
-  if (simple && testImplicitResolving(state, object)) {
-    simple = false;
-  }
+  if (simple && testImplicitResolving(state, object)) simple = false;
 
   modifier = '';
   if (folded || literal) {
@@ -449,11 +434,8 @@ function writeScalar(state, object, level, iskey) {
       }
     }
 
-    if (trailingLineBreaks === 0) {
-      modifier = '-';
-    } else if (trailingLineBreaks === 2) {
-      modifier = '+';
-    }
+    if (trailingLineBreaks === 0) modifier = '-';
+    else if (trailingLineBreaks === 2) modifier = '+';
   }
 
   if (literal && longestLine < max || state.tag !== null) {
@@ -462,9 +444,7 @@ function writeScalar(state, object, level, iskey) {
 
   // If it's literally one line, then don't bother with the literal.
   // We may still want to do a fold, though, if it's a super long line.
-  if (!sawLineFeed) {
-    literal = false;
-  }
+  if (!sawLineFeed) literal = false;
 
   if (simple) {
     state.dump = object;
@@ -474,9 +454,7 @@ function writeScalar(state, object, level, iskey) {
     result = fold(object, max);
     state.dump = '>' + modifier + '\n' + indentString(result, indent);
   } else if (literal) {
-    if (!modifier) {
-      object = object.replace(/\n$/, '');
-    }
+    if (!modifier) object = object.replace(/\n$/, '');
     state.dump = '|' + modifier + '\n' + indentString(object, indent);
   } else if (double) {
     double.finish();
@@ -514,30 +492,24 @@ function fold(object, max) {
   while (position < length) {
     newLine = object.indexOf('\n', position);
     if (newLine > length || newLine === -1) {
-      if (result) {
-        result += '\n\n';
-      }
+      if (result) result += '\n\n';
       result += foldLine(object.slice(position, length), max);
       position = length;
+
     } else {
-      if (result) {
-        result += '\n\n';
-      }
+      if (result) result += '\n\n';
       result += foldLine(object.slice(position, newLine), max);
       position = newLine + 1;
     }
   }
-  if (trailing && trailing[0] !== '\n') {
-    result += trailing[0];
-  }
+
+  if (trailing && trailing[0] !== '\n') result += trailing[0];
 
   return result;
 }
 
 function foldLine(line, max) {
-  if (line === '') {
-    return line;
-  }
+  if (line === '') return line;
 
   var foldRe = /[^\s] [^\s]/g,
       result = '',
@@ -555,15 +527,10 @@ function foldLine(line, max) {
     // been ok, use that one, and carry on.  If there was no previous
     // match on this fold section, then just have a long line.
     if (index - foldStart > max) {
-      if (prevMatch !== foldStart) {
-        foldEnd = prevMatch;
-      } else {
-        foldEnd = index;
-      }
+      if (prevMatch !== foldStart) foldEnd = prevMatch;
+      else foldEnd = index;
 
-      if (result) {
-        result += '\n';
-      }
+      if (result) result += '\n';
       folded = line.slice(foldStart, foldEnd);
       result += folded;
       foldStart = foldEnd + 1;
@@ -572,9 +539,7 @@ function foldLine(line, max) {
     match = foldRe.exec(line);
   }
 
-  if (result) {
-    result += '\n';
-  }
+  if (result) result += '\n';
 
   // if we end up with one last word at the end, then the last bit might
   // be slightly bigger than we wanted, because we exited out of the loop.
@@ -615,7 +580,7 @@ function simpleChar(character) {
 // Returns true if the character code needs to be escaped.
 function needsHexEscape(character) {
   return !((0x00020 <= character && character <= 0x00007E) ||
-           (0x00085 === character)                         ||
+           (character === 0x00085)                         ||
            (0x000A0 <= character && character <= 0x00D7FF) ||
            (0x0E000 <= character && character <= 0x00FFFD) ||
            (0x10000 <= character && character <= 0x10FFFF));
@@ -630,9 +595,7 @@ function writeFlowSequence(state, level, object) {
   for (index = 0, length = object.length; index < length; index += 1) {
     // Write only valid elements.
     if (writeNode(state, level, object[index], false, false)) {
-      if (0 !== index) {
-        _result += ', ';
-      }
+      if (index !== 0) _result += ', ';
       _result += state.dump;
     }
   }
@@ -650,7 +613,7 @@ function writeBlockSequence(state, level, object, compact) {
   for (index = 0, length = object.length; index < length; index += 1) {
     // Write only valid elements.
     if (writeNode(state, level + 1, object[index], true, true)) {
-      if (!compact || 0 !== index) {
+      if (!compact || index !== 0) {
         _result += generateNextLine(state, level);
       }
       _result += '- ' + state.dump;
@@ -674,9 +637,7 @@ function writeFlowMapping(state, level, object) {
   for (index = 0, length = objectKeyList.length; index < length; index += 1) {
     pairBuffer = '';
 
-    if (0 !== index) {
-      pairBuffer += ', ';
-    }
+    if (index !== 0) pairBuffer += ', ';
 
     objectKey = objectKeyList[index];
     objectValue = object[objectKey];
@@ -685,9 +646,7 @@ function writeFlowMapping(state, level, object) {
       continue; // Skip this pair because of invalid key;
     }
 
-    if (state.dump.length > 1024) {
-      pairBuffer += '? ';
-    }
+    if (state.dump.length > 1024) pairBuffer += '? ';
 
     pairBuffer += state.dump + ': ';
 
@@ -731,7 +690,7 @@ function writeBlockMapping(state, level, object, compact) {
   for (index = 0, length = objectKeyList.length; index < length; index += 1) {
     pairBuffer = '';
 
-    if (!compact || 0 !== index) {
+    if (!compact || index !== 0) {
       pairBuffer += generateNextLine(state, level);
     }
 
@@ -742,7 +701,7 @@ function writeBlockMapping(state, level, object, compact) {
       continue; // Skip this pair because of invalid key.
     }
 
-    explicitPair = (null !== state.tag && '?' !== state.tag) ||
+    explicitPair = (state.tag !== null && state.tag !== '?') ||
                    (state.dump && state.dump.length > 1024);
 
     if (explicitPair) {
@@ -788,7 +747,7 @@ function detectType(state, object, explicit) {
     type = typeList[index];
 
     if ((type.instanceOf  || type.predicate) &&
-        (!type.instanceOf || (('object' === typeof object) && (object instanceof type.instanceOf))) &&
+        (!type.instanceOf || ((typeof object === 'object') && (object instanceof type.instanceOf))) &&
         (!type.predicate  || type.predicate(object))) {
 
       state.tag = explicit ? type.tag : '?';
@@ -796,7 +755,7 @@ function detectType(state, object, explicit) {
       if (type.represent) {
         style = state.styleMap[type.tag] || type.defaultStyle;
 
-        if ('[object Function]' === _toString.call(type.represent)) {
+        if (_toString.call(type.represent) === '[object Function]') {
           _result = type.represent(object, style);
         } else if (_hasOwnProperty.call(type.represent, style)) {
           _result = type.represent[style](object, style);
@@ -828,10 +787,10 @@ function writeNode(state, level, object, block, compact, iskey) {
   var type = _toString.call(state.dump);
 
   if (block) {
-    block = (0 > state.flowLevel || state.flowLevel > level);
+    block = (state.flowLevel < 0 || state.flowLevel > level);
   }
 
-  var objectOrArray = '[object Object]' === type || '[object Array]' === type,
+  var objectOrArray = type === '[object Object]' || type === '[object Array]',
       duplicateIndex,
       duplicate;
 
@@ -840,7 +799,7 @@ function writeNode(state, level, object, block, compact, iskey) {
     duplicate = duplicateIndex !== -1;
   }
 
-  if ((null !== state.tag && '?' !== state.tag) || duplicate || (2 !== state.indent && level > 0)) {
+  if ((state.tag !== null && state.tag !== '?') || duplicate || (state.indent !== 2 && level > 0)) {
     compact = false;
   }
 
@@ -850,8 +809,8 @@ function writeNode(state, level, object, block, compact, iskey) {
     if (objectOrArray && duplicate && !state.usedDuplicates[duplicateIndex]) {
       state.usedDuplicates[duplicateIndex] = true;
     }
-    if ('[object Object]' === type) {
-      if (block && (0 !== Object.keys(state.dump).length)) {
+    if (type === '[object Object]') {
+      if (block && (Object.keys(state.dump).length !== 0)) {
         writeBlockMapping(state, level, state.dump, compact);
         if (duplicate) {
           state.dump = '&ref_' + duplicateIndex + state.dump;
@@ -862,8 +821,8 @@ function writeNode(state, level, object, block, compact, iskey) {
           state.dump = '&ref_' + duplicateIndex + ' ' + state.dump;
         }
       }
-    } else if ('[object Array]' === type) {
-      if (block && (0 !== state.dump.length)) {
+    } else if (type === '[object Array]') {
+      if (block && (state.dump.length !== 0)) {
         writeBlockSequence(state, level, state.dump, compact);
         if (duplicate) {
           state.dump = '&ref_' + duplicateIndex + state.dump;
@@ -874,18 +833,16 @@ function writeNode(state, level, object, block, compact, iskey) {
           state.dump = '&ref_' + duplicateIndex + ' ' + state.dump;
         }
       }
-    } else if ('[object String]' === type) {
-      if ('?' !== state.tag) {
+    } else if (type === '[object String]') {
+      if (state.tag !== '?') {
         writeScalar(state, state.dump, level, iskey);
       }
     } else {
-      if (state.skipInvalid) {
-        return false;
-      }
+      if (state.skipInvalid) return false;
       throw new YAMLException('unacceptable kind of an object to dump ' + type);
     }
 
-    if (null !== state.tag && '?' !== state.tag) {
+    if (state.tag !== null && state.tag !== '?') {
       state.dump = '!<' + state.tag + '> ' + state.dump;
     }
   }
@@ -912,10 +869,10 @@ function inspectNode(object, objects, duplicatesIndexes) {
       index,
       length;
 
-  if (null !== object && 'object' === typeof object) {
+  if (object !== null && typeof object === 'object') {
     index = objects.indexOf(object);
-    if (-1 !== index) {
-      if (-1 === duplicatesIndexes.indexOf(index)) {
+    if (index !== -1) {
+      if (duplicatesIndexes.indexOf(index) === -1) {
         duplicatesIndexes.push(index);
       }
     } else {
@@ -941,13 +898,10 @@ function dump(input, options) {
 
   var state = new State(options);
 
-  if (!state.noRefs) {
-    getDuplicateReferences(input, state);
-  }
+  if (!state.noRefs) getDuplicateReferences(input, state);
+
+  if (writeNode(state, 0, input, true, true)) return state.dump + '\n';
 
-  if (writeNode(state, 0, input, true, true)) {
-    return state.dump + '\n';
-  }
   return '';
 }
 
@@ -1052,11 +1006,11 @@ function is_WS_OR_EOL(c) {
 }
 
 function is_FLOW_INDICATOR(c) {
-  return 0x2C/* , */ === c ||
-         0x5B/* [ */ === c ||
-         0x5D/* ] */ === c ||
-         0x7B/* { */ === c ||
-         0x7D/* } */ === c;
+  return c === 0x2C/* , */ ||
+         c === 0x5B/* [ */ ||
+         c === 0x5D/* ] */ ||
+         c === 0x7B/* { */ ||
+         c === 0x7D/* } */;
 }
 
 function fromHexCode(c) {
@@ -1138,6 +1092,7 @@ function State(input, options) {
   this.onWarning = options['onWarning'] || null;
   this.legacy    = options['legacy']    || false;
   this.json      = options['json']      || false;
+  this.listener  = options['listener']  || null;
 
   this.implicitTypes = this.schema.compiledImplicit;
   this.typeMap       = this.schema.compiledTypeMap;
@@ -1184,62 +1139,62 @@ var directiveHandlers = {
 
   YAML: function handleYamlDirective(state, name, args) {
 
-      var match, major, minor;
+    var match, major, minor;
 
-      if (null !== state.version) {
-        throwError(state, 'duplication of %YAML directive');
-      }
+    if (state.version !== null) {
+      throwError(state, 'duplication of %YAML directive');
+    }
 
-      if (1 !== args.length) {
-        throwError(state, 'YAML directive accepts exactly one argument');
-      }
+    if (args.length !== 1) {
+      throwError(state, 'YAML directive accepts exactly one argument');
+    }
 
-      match = /^([0-9]+)\.([0-9]+)$/.exec(args[0]);
+    match = /^([0-9]+)\.([0-9]+)$/.exec(args[0]);
 
-      if (null === match) {
-        throwError(state, 'ill-formed argument of the YAML directive');
-      }
+    if (match === null) {
+      throwError(state, 'ill-formed argument of the YAML directive');
+    }
 
-      major = parseInt(match[1], 10);
-      minor = parseInt(match[2], 10);
+    major = parseInt(match[1], 10);
+    minor = parseInt(match[2], 10);
 
-      if (1 !== major) {
-        throwError(state, 'unacceptable YAML version of the document');
-      }
+    if (major !== 1) {
+      throwError(state, 'unacceptable YAML version of the document');
+    }
 
-      state.version = args[0];
-      state.checkLineBreaks = (minor < 2);
+    state.version = args[0];
+    state.checkLineBreaks = (minor < 2);
 
-      if (1 !== minor && 2 !== minor) {
-        throwWarning(state, 'unsupported YAML version of the document');
-      }
-    },
+    if (minor !== 1 && minor !== 2) {
+      throwWarning(state, 'unsupported YAML version of the document');
+    }
+  },
 
   TAG: function handleTagDirective(state, name, args) {
 
-      var handle, prefix;
+    var handle, prefix;
 
-      if (2 !== args.length) {
-        throwError(state, 'TAG directive accepts exactly two arguments');
-      }
+    if (args.length !== 2) {
+      throwError(state, 'TAG directive accepts exactly two arguments');
+    }
 
-      handle = args[0];
-      prefix = args[1];
+    handle = args[0];
+    prefix = args[1];
 
-      if (!PATTERN_TAG_HANDLE.test(handle)) {
-        throwError(state, 'ill-formed tag handle (first argument) of the TAG directive');
-      }
-
-      if (_hasOwnProperty.call(state.tagMap, handle)) {
-        throwError(state, 'there is a previously declared suffix for "' + handle + '" tag handle');
-      }
+    if (!PATTERN_TAG_HANDLE.test(handle)) {
+      throwError(state, 'ill-formed tag handle (first argument) of the TAG directive');
+    }
 
-      if (!PATTERN_TAG_URI.test(prefix)) {
-        throwError(state, 'ill-formed tag prefix (second argument) of the TAG directive');
-      }
+    if (_hasOwnProperty.call(state.tagMap, handle)) {
+      throwError(state, 'there is a previously declared suffix for "' + handle + '" tag handle');
+    }
 
-      state.tagMap[handle] = prefix;
+    if (!PATTERN_TAG_URI.test(prefix)) {
+      throwError(state, 'ill-formed tag prefix (second argument) of the TAG directive');
     }
+
+    state.tagMap[handle] = prefix;
+  }
 };
 
 
@@ -1254,8 +1209,8 @@ function captureSegment(state, start, end, checkJson) {
            _position < _length;
            _position += 1) {
         _character = _result.charCodeAt(_position);
-        if (!(0x09 === _character ||
-              0x20 <= _character && _character <= 0x10FFFF)) {
+        if (!(_character === 0x09 ||
+              (0x20 <= _character && _character <= 0x10FFFF))) {
           throwError(state, 'expected valid JSON character');
         }
       }
@@ -1291,11 +1246,11 @@ function storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valu
 
   keyNode = String(keyNode);
 
-  if (null === _result) {
+  if (_result === null) {
     _result = {};
   }
 
-  if ('tag:yaml.org,2002:merge' === keyTag) {
+  if (keyTag === 'tag:yaml.org,2002:merge') {
     if (Array.isArray(valueNode)) {
       for (index = 0, quantity = valueNode.length; index < quantity; index += 1) {
         mergeMappings(state, _result, valueNode[index], overridableKeys);
@@ -1321,11 +1276,11 @@ function readLineBreak(state) {
 
   ch = state.input.charCodeAt(state.position);
 
-  if (0x0A/* LF */ === ch) {
+  if (ch === 0x0A/* LF */) {
     state.position++;
-  } else if (0x0D/* CR */ === ch) {
+  } else if (ch === 0x0D/* CR */) {
     state.position++;
-    if (0x0A/* LF */ === state.input.charCodeAt(state.position)) {
+    if (state.input.charCodeAt(state.position) === 0x0A/* LF */) {
       state.position++;
     }
   } else {
@@ -1340,15 +1295,15 @@ function skipSeparationSpace(state, allowComments, checkIndent) {
   var lineBreaks = 0,
       ch = state.input.charCodeAt(state.position);
 
-  while (0 !== ch) {
+  while (ch !== 0) {
     while (is_WHITE_SPACE(ch)) {
       ch = state.input.charCodeAt(++state.position);
     }
 
-    if (allowComments && 0x23/* # */ === ch) {
+    if (allowComments && ch === 0x23/* # */) {
       do {
         ch = state.input.charCodeAt(++state.position);
-      } while (ch !== 0x0A/* LF */ && ch !== 0x0D/* CR */ && 0 !== ch);
+      } while (ch !== 0x0A/* LF */ && ch !== 0x0D/* CR */ && ch !== 0);
     }
 
     if (is_EOL(ch)) {
@@ -1358,7 +1313,7 @@ function skipSeparationSpace(state, allowComments, checkIndent) {
       lineBreaks++;
       state.lineIndent = 0;
 
-      while (0x20/* Space */ === ch) {
+      while (ch === 0x20/* Space */) {
         state.lineIndent++;
         ch = state.input.charCodeAt(++state.position);
       }
@@ -1367,7 +1322,7 @@ function skipSeparationSpace(state, allowComments, checkIndent) {
     }
   }
 
-  if (-1 !== checkIndent && 0 !== lineBreaks && state.lineIndent < checkIndent) {
+  if (checkIndent !== -1 && lineBreaks !== 0 && state.lineIndent < checkIndent) {
     throwWarning(state, 'deficient indentation');
   }
 
@@ -1382,9 +1337,9 @@ function testDocumentSeparator(state) {
 
   // Condition state.position === state.lineStart is tested
   // in parent on each call, for efficiency. No needs to test here again.
-  if ((0x2D/* - */ === ch || 0x2E/* . */ === ch) &&
-      state.input.charCodeAt(_position + 1) === ch &&
-      state.input.charCodeAt(_position + 2) === ch) {
+  if ((ch === 0x2D/* - */ || ch === 0x2E/* . */) &&
+      ch === state.input.charCodeAt(_position + 1) &&
+      ch === state.input.charCodeAt(_position + 2)) {
 
     _position += 3;
 
@@ -1399,7 +1354,7 @@ function testDocumentSeparator(state) {
 }
 
 function writeFoldedLines(state, count) {
-  if (1 === count) {
+  if (count === 1) {
     state.result += ' ';
   } else if (count > 1) {
     state.result += common.repeat('\n', count - 1);
@@ -1422,23 +1377,23 @@ function readPlainScalar(state, nodeIndent, withinFlowCollection) {
 
   ch = state.input.charCodeAt(state.position);
 
-  if (is_WS_OR_EOL(ch)             ||
-      is_FLOW_INDICATOR(ch)        ||
-      0x23/* # */           === ch ||
-      0x26/* & */           === ch ||
-      0x2A/* * */           === ch ||
-      0x21/* ! */           === ch ||
-      0x7C/* | */           === ch ||
-      0x3E/* > */           === ch ||
-      0x27/* ' */           === ch ||
-      0x22/* " */           === ch ||
-      0x25/* % */           === ch ||
-      0x40/* @ */           === ch ||
-      0x60/* ` */           === ch) {
+  if (is_WS_OR_EOL(ch)      ||
+      is_FLOW_INDICATOR(ch) ||
+      ch === 0x23/* # */    ||
+      ch === 0x26/* & */    ||
+      ch === 0x2A/* * */    ||
+      ch === 0x21/* ! */    ||
+      ch === 0x7C/* | */    ||
+      ch === 0x3E/* > */    ||
+      ch === 0x27/* ' */    ||
+      ch === 0x22/* " */    ||
+      ch === 0x25/* % */    ||
+      ch === 0x40/* @ */    ||
+      ch === 0x60/* ` */) {
     return false;
   }
 
-  if (0x3F/* ? */ === ch || 0x2D/* - */ === ch) {
+  if (ch === 0x3F/* ? */ || ch === 0x2D/* - */) {
     following = state.input.charCodeAt(state.position + 1);
 
     if (is_WS_OR_EOL(following) ||
@@ -1452,8 +1407,8 @@ function readPlainScalar(state, nodeIndent, withinFlowCollection) {
   captureStart = captureEnd = state.position;
   hasPendingContent = false;
 
-  while (0 !== ch) {
-    if (0x3A/* : */ === ch) {
+  while (ch !== 0) {
+    if (ch === 0x3A/* : */) {
       following = state.input.charCodeAt(state.position + 1);
 
       if (is_WS_OR_EOL(following) ||
@@ -1461,7 +1416,7 @@ function readPlainScalar(state, nodeIndent, withinFlowCollection) {
         break;
       }
 
-    } else if (0x23/* # */ === ch) {
+    } else if (ch === 0x23/* # */) {
       preceding = state.input.charCodeAt(state.position - 1);
 
       if (is_WS_OR_EOL(preceding)) {
@@ -1522,7 +1477,7 @@ function readSingleQuotedScalar(state, nodeIndent) {
 
   ch = state.input.charCodeAt(state.position);
 
-  if (0x27/* ' */ !== ch) {
+  if (ch !== 0x27/* ' */) {
     return false;
   }
 
@@ -1531,12 +1486,12 @@ function readSingleQuotedScalar(state, nodeIndent) {
   state.position++;
   captureStart = captureEnd = state.position;
 
-  while (0 !== (ch = state.input.charCodeAt(state.position))) {
-    if (0x27/* ' */ === ch) {
+  while ((ch = state.input.charCodeAt(state.position)) !== 0) {
+    if (ch === 0x27/* ' */) {
       captureSegment(state, captureStart, state.position, true);
       ch = state.input.charCodeAt(++state.position);
 
-      if (0x27/* ' */ === ch) {
+      if (ch === 0x27/* ' */) {
         captureStart = captureEnd = state.position;
         state.position++;
       } else {
@@ -1570,7 +1525,7 @@ function readDoubleQuotedScalar(state, nodeIndent) {
 
   ch = state.input.charCodeAt(state.position);
 
-  if (0x22/* " */ !== ch) {
+  if (ch !== 0x22/* " */) {
     return false;
   }
 
@@ -1579,13 +1534,13 @@ function readDoubleQuotedScalar(state, nodeIndent) {
   state.position++;
   captureStart = captureEnd = state.position;
 
-  while (0 !== (ch = state.input.charCodeAt(state.position))) {
-    if (0x22/* " */ === ch) {
+  while ((ch = state.input.charCodeAt(state.position)) !== 0) {
+    if (ch === 0x22/* " */) {
       captureSegment(state, captureStart, state.position, true);
       state.position++;
       return true;
 
-    } else if (0x5C/* \ */ === ch) {
+    } else if (ch === 0x5C/* \ */) {
       captureSegment(state, captureStart, state.position, true);
       ch = state.input.charCodeAt(++state.position);
 
@@ -1670,13 +1625,13 @@ function readFlowCollection(state, nodeIndent) {
     return false;
   }
 
-  if (null !== state.anchor) {
+  if (state.anchor !== null) {
     state.anchorMap[state.anchor] = _result;
   }
 
   ch = state.input.charCodeAt(++state.position);
 
-  while (0 !== ch) {
+  while (ch !== 0) {
     skipSeparationSpace(state, true, nodeIndent);
 
     ch = state.input.charCodeAt(state.position);
@@ -1695,7 +1650,7 @@ function readFlowCollection(state, nodeIndent) {
     keyTag = keyNode = valueNode = null;
     isPair = isExplicitPair = false;
 
-    if (0x3F/* ? */ === ch) {
+    if (ch === 0x3F/* ? */) {
       following = state.input.charCodeAt(state.position + 1);
 
       if (is_WS_OR_EOL(following)) {
@@ -1713,7 +1668,7 @@ function readFlowCollection(state, nodeIndent) {
 
     ch = state.input.charCodeAt(state.position);
 
-    if ((isExplicitPair || state.line === _line) && 0x3A/* : */ === ch) {
+    if ((isExplicitPair || state.line === _line) && ch === 0x3A/* : */) {
       isPair = true;
       ch = state.input.charCodeAt(++state.position);
       skipSeparationSpace(state, true, nodeIndent);
@@ -1733,7 +1688,7 @@ function readFlowCollection(state, nodeIndent) {
 
     ch = state.input.charCodeAt(state.position);
 
-    if (0x2C/* , */ === ch) {
+    if (ch === 0x2C/* , */) {
       readNext = true;
       ch = state.input.charCodeAt(++state.position);
     } else {
@@ -1768,12 +1723,12 @@ function readBlockScalar(state, nodeIndent) {
   state.kind = 'scalar';
   state.result = '';
 
-  while (0 !== ch) {
+  while (ch !== 0) {
     ch = state.input.charCodeAt(++state.position);
 
-    if (0x2B/* + */ === ch || 0x2D/* - */ === ch) {
+    if (ch === 0x2B/* + */ || ch === 0x2D/* - */) {
       if (CHOMPING_CLIP === chomping) {
-        chomping = (0x2B/* + */ === ch) ? CHOMPING_KEEP : CHOMPING_STRIP;
+        chomping = (ch === 0x2B/* + */) ? CHOMPING_KEEP : CHOMPING_STRIP;
       } else {
         throwError(state, 'repeat of a chomping mode identifier');
       }
@@ -1797,20 +1752,20 @@ function readBlockScalar(state, nodeIndent) {
     do { ch = state.input.charCodeAt(++state.position); }
     while (is_WHITE_SPACE(ch));
 
-    if (0x23/* # */ === ch) {
+    if (ch === 0x23/* # */) {
       do { ch = state.input.charCodeAt(++state.position); }
-      while (!is_EOL(ch) && (0 !== ch));
+      while (!is_EOL(ch) && (ch !== 0));
     }
   }
 
-  while (0 !== ch) {
+  while (ch !== 0) {
     readLineBreak(state);
     state.lineIndent = 0;
 
     ch = state.input.charCodeAt(state.position);
 
     while ((!detectedIndent || state.lineIndent < textIndent) &&
-           (0x20/* Space */ === ch)) {
+           (ch === 0x20/* Space */)) {
       state.lineIndent++;
       ch = state.input.charCodeAt(++state.position);
     }
@@ -1854,7 +1809,7 @@ function readBlockScalar(state, nodeIndent) {
         state.result += common.repeat('\n', emptyLines + 1);
 
       // Just one line break - perceive as the same line.
-      } else if (0 === emptyLines) {
+      } else if (emptyLines === 0) {
         if (detectedIndent) { // i.e. only if we have already read some scalar content.
           state.result += ' ';
         }
@@ -1877,7 +1832,7 @@ function readBlockScalar(state, nodeIndent) {
     emptyLines = 0;
     captureStart = state.position;
 
-    while (!is_EOL(ch) && (0 !== ch)) {
+    while (!is_EOL(ch) && (ch !== 0)) {
       ch = state.input.charCodeAt(++state.position);
     }
 
@@ -1896,15 +1851,15 @@ function readBlockSequence(state, nodeIndent) {
       detected  = false,
       ch;
 
-  if (null !== state.anchor) {
+  if (state.anchor !== null) {
     state.anchorMap[state.anchor] = _result;
   }
 
   ch = state.input.charCodeAt(state.position);
 
-  while (0 !== ch) {
+  while (ch !== 0) {
 
-    if (0x2D/* - */ !== ch) {
+    if (ch !== 0x2D/* - */) {
       break;
     }
 
@@ -1932,7 +1887,7 @@ function readBlockSequence(state, nodeIndent) {
 
     ch = state.input.charCodeAt(state.position);
 
-    if ((state.line === _line || state.lineIndent > nodeIndent) && (0 !== ch)) {
+    if ((state.line === _line || state.lineIndent > nodeIndent) && (ch !== 0)) {
       throwError(state, 'bad indentation of a sequence entry');
     } else if (state.lineIndent < nodeIndent) {
       break;
@@ -1964,13 +1919,13 @@ function readBlockMapping(state, nodeIndent, flowIndent) {
       detected      = false,
       ch;
 
-  if (null !== state.anchor) {
+  if (state.anchor !== null) {
     state.anchorMap[state.anchor] = _result;
   }
 
   ch = state.input.charCodeAt(state.position);
 
-  while (0 !== ch) {
+  while (ch !== 0) {
     following = state.input.charCodeAt(state.position + 1);
     _line = state.line; // Save the current line.
 
@@ -1978,9 +1933,9 @@ function readBlockMapping(state, nodeIndent, flowIndent) {
     // Explicit notation case. There are two separate blocks:
     // first for the key (denoted by "?") and second for the value (denoted by ":")
     //
-    if ((0x3F/* ? */ === ch || 0x3A/* : */  === ch) && is_WS_OR_EOL(following)) {
+    if ((ch === 0x3F/* ? */ || ch === 0x3A/* : */) && is_WS_OR_EOL(following)) {
 
-      if (0x3F/* ? */ === ch) {
+      if (ch === 0x3F/* ? */) {
         if (atExplicitKey) {
           storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null);
           keyTag = keyNode = valueNode = null;
@@ -2014,7 +1969,7 @@ function readBlockMapping(state, nodeIndent, flowIndent) {
           ch = state.input.charCodeAt(++state.position);
         }
 
-        if (0x3A/* : */ === ch) {
+        if (ch === 0x3A/* : */) {
           ch = state.input.charCodeAt(++state.position);
 
           if (!is_WS_OR_EOL(ch)) {
@@ -2075,7 +2030,7 @@ function readBlockMapping(state, nodeIndent, flowIndent) {
       ch = state.input.charCodeAt(state.position);
     }
 
-    if (state.lineIndent > nodeIndent && (0 !== ch)) {
+    if (state.lineIndent > nodeIndent && (ch !== 0)) {
       throwError(state, 'bad indentation of a mapping entry');
     } else if (state.lineIndent < nodeIndent) {
       break;
@@ -2112,21 +2067,19 @@ function readTagProperty(state) {
 
   ch = state.input.charCodeAt(state.position);
 
-  if (0x21/* ! */ !== ch) {
-    return false;
-  }
+  if (ch !== 0x21/* ! */) return false;
 
-  if (null !== state.tag) {
+  if (state.tag !== null) {
     throwError(state, 'duplication of a tag property');
   }
 
   ch = state.input.charCodeAt(++state.position);
 
-  if (0x3C/* < */ === ch) {
+  if (ch === 0x3C/* < */) {
     isVerbatim = true;
     ch = state.input.charCodeAt(++state.position);
 
-  } else if (0x21/* ! */ === ch) {
+  } else if (ch === 0x21/* ! */) {
     isNamed = true;
     tagHandle = '!!';
     ch = state.input.charCodeAt(++state.position);
@@ -2139,7 +2092,7 @@ function readTagProperty(state) {
 
   if (isVerbatim) {
     do { ch = state.input.charCodeAt(++state.position); }
-    while (0 !== ch && 0x3E/* > */ !== ch);
+    while (ch !== 0 && ch !== 0x3E/* > */);
 
     if (state.position < state.length) {
       tagName = state.input.slice(_position, state.position);
@@ -2148,9 +2101,9 @@ function readTagProperty(state) {
       throwError(state, 'unexpected end of the stream within a verbatim tag');
     }
   } else {
-    while (0 !== ch && !is_WS_OR_EOL(ch)) {
+    while (ch !== 0 && !is_WS_OR_EOL(ch)) {
 
-      if (0x21/* ! */ === ch) {
+      if (ch === 0x21/* ! */) {
         if (!isNamed) {
           tagHandle = state.input.slice(_position - 1, state.position + 1);
 
@@ -2185,10 +2138,10 @@ function readTagProperty(state) {
   } else if (_hasOwnProperty.call(state.tagMap, tagHandle)) {
     state.tag = state.tagMap[tagHandle] + tagName;
 
-  } else if ('!' === tagHandle) {
+  } else if (tagHandle === '!') {
     state.tag = '!' + tagName;
 
-  } else if ('!!' === tagHandle) {
+  } else if (tagHandle === '!!') {
     state.tag = 'tag:yaml.org,2002:' + tagName;
 
   } else {
@@ -2204,18 +2157,16 @@ function readAnchorProperty(state) {
 
   ch = state.input.charCodeAt(state.position);
 
-  if (0x26/* & */ !== ch) {
-    return false;
-  }
+  if (ch !== 0x26/* & */) return false;
 
-  if (null !== state.anchor) {
+  if (state.anchor !== null) {
     throwError(state, 'duplication of an anchor property');
   }
 
   ch = state.input.charCodeAt(++state.position);
   _position = state.position;
 
-  while (0 !== ch && !is_WS_OR_EOL(ch) && !is_FLOW_INDICATOR(ch)) {
+  while (ch !== 0 && !is_WS_OR_EOL(ch) && !is_FLOW_INDICATOR(ch)) {
     ch = state.input.charCodeAt(++state.position);
   }
 
@@ -2233,14 +2184,12 @@ function readAlias(state) {
 
   ch = state.input.charCodeAt(state.position);
 
-  if (0x2A/* * */ !== ch) {
-    return false;
-  }
+  if (ch !== 0x2A/* * */) return false;
 
   ch = state.input.charCodeAt(++state.position);
   _position = state.position;
 
-  while (0 !== ch && !is_WS_OR_EOL(ch) && !is_FLOW_INDICATOR(ch)) {
+  while (ch !== 0 && !is_WS_OR_EOL(ch) && !is_FLOW_INDICATOR(ch)) {
     ch = state.input.charCodeAt(++state.position);
   }
 
@@ -2272,6 +2221,10 @@ function composeNode(state, parentIndent, nodeContext, allowToSeek, allowCompact
       flowIndent,
       blockIndent;
 
+  if (state.listener !== null) {
+    state.listener('open', state);
+  }
+
   state.tag    = null;
   state.anchor = null;
   state.kind   = null;
@@ -2295,7 +2248,7 @@ function composeNode(state, parentIndent, nodeContext, allowToSeek, allowCompact
     }
   }
 
-  if (1 === indentStatus) {
+  if (indentStatus === 1) {
     while (readTagProperty(state) || readAnchorProperty(state)) {
       if (skipSeparationSpace(state, true, -1)) {
         atNewLine = true;
@@ -2318,7 +2271,7 @@ function composeNode(state, parentIndent, nodeContext, allowToSeek, allowCompact
     allowBlockCollections = atNewLine || allowCompact;
   }
 
-  if (1 === indentStatus || CONTEXT_BLOCK_OUT === nodeContext) {
+  if (indentStatus === 1 || CONTEXT_BLOCK_OUT === nodeContext) {
     if (CONTEXT_FLOW_IN === nodeContext || CONTEXT_FLOW_OUT === nodeContext) {
       flowIndent = parentIndent;
     } else {
@@ -2327,7 +2280,7 @@ function composeNode(state, parentIndent, nodeContext, allowToSeek, allowCompact
 
     blockIndent = state.position - state.lineStart;
 
-    if (1 === indentStatus) {
+    if (indentStatus === 1) {
       if (allowBlockCollections &&
           (readBlockSequence(state, blockIndent) ||
            readBlockMapping(state, blockIndent, flowIndent)) ||
@@ -2342,31 +2295,31 @@ function composeNode(state, parentIndent, nodeContext, allowToSeek, allowCompact
         } else if (readAlias(state)) {
           hasContent = true;
 
-          if (null !== state.tag || null !== state.anchor) {
+          if (state.tag !== null || state.anchor !== null) {
             throwError(state, 'alias node should not have any properties');
           }
 
         } else if (readPlainScalar(state, flowIndent, CONTEXT_FLOW_IN === nodeContext)) {
           hasContent = true;
 
-          if (null === state.tag) {
+          if (state.tag === null) {
             state.tag = '?';
           }
         }
 
-        if (null !== state.anchor) {
+        if (state.anchor !== null) {
           state.anchorMap[state.anchor] = state.result;
         }
       }
-    } else if (0 === indentStatus) {
+    } else if (indentStatus === 0) {
       // Special case: block sequences are allowed to have same indentation level as the parent.
       // http://www.yaml.org/spec/1.2/spec.html#id2799784
       hasContent = allowBlockCollections && readBlockSequence(state, blockIndent);
     }
   }
 
-  if (null !== state.tag && '!' !== state.tag) {
-    if ('?' === state.tag) {
+  if (state.tag !== null && state.tag !== '!') {
+    if (state.tag === '?') {
       for (typeIndex = 0, typeQuantity = state.implicitTypes.length;
            typeIndex < typeQuantity;
            typeIndex += 1) {
@@ -2379,7 +2332,7 @@ function composeNode(state, parentIndent, nodeContext, allowToSeek, allowCompact
         if (type.resolve(state.result)) { // `state.result` updated in resolver if matched
           state.result = type.construct(state.result);
           state.tag = type.tag;
-          if (null !== state.anchor) {
+          if (state.anchor !== null) {
             state.anchorMap[state.anchor] = state.result;
           }
           break;
@@ -2388,7 +2341,7 @@ function composeNode(state, parentIndent, nodeContext, allowToSeek, allowCompact
     } else if (_hasOwnProperty.call(state.typeMap, state.tag)) {
       type = state.typeMap[state.tag];
 
-      if (null !== state.result && type.kind !== state.kind) {
+      if (state.result !== null && type.kind !== state.kind) {
         throwError(state, 'unacceptable node kind for !<' + state.tag + '> tag; it should be "' + type.kind + '", not "' + state.kind + '"');
       }
 
@@ -2396,7 +2349,7 @@ function composeNode(state, parentIndent, nodeContext, allowToSeek, allowCompact
         throwError(state, 'cannot resolve a node with !<' + state.tag + '> explicit tag');
       } else {
         state.result = type.construct(state.result);
-        if (null !== state.anchor) {
+        if (state.anchor !== null) {
           state.anchorMap[state.anchor] = state.result;
         }
       }
@@ -2405,7 +2358,10 @@ function composeNode(state, parentIndent, nodeContext, allowToSeek, allowCompact
     }
   }
 
-  return null !== state.tag || null !== state.anchor || hasContent;
+  if (state.listener !== null) {
+    state.listener('close', state);
+  }
+  return state.tag !== null ||  state.anchor !== null || hasContent;
 }
 
 function readDocument(state) {
@@ -2421,12 +2377,12 @@ function readDocument(state) {
   state.tagMap = {};
   state.anchorMap = {};
 
-  while (0 !== (ch = state.input.charCodeAt(state.position))) {
+  while ((ch = state.input.charCodeAt(state.position)) !== 0) {
     skipSeparationSpace(state, true, -1);
 
     ch = state.input.charCodeAt(state.position);
 
-    if (state.lineIndent > 0 || 0x25/* % */ !== ch) {
+    if (state.lineIndent > 0 || ch !== 0x25/* % */) {
       break;
     }
 
@@ -2434,7 +2390,7 @@ function readDocument(state) {
     ch = state.input.charCodeAt(++state.position);
     _position = state.position;
 
-    while (0 !== ch && !is_WS_OR_EOL(ch)) {
+    while (ch !== 0 && !is_WS_OR_EOL(ch)) {
       ch = state.input.charCodeAt(++state.position);
     }
 
@@ -2445,33 +2401,29 @@ function readDocument(state) {
       throwError(state, 'directive name must not be less than one character in length');
     }
 
-    while (0 !== ch) {
+    while (ch !== 0) {
       while (is_WHITE_SPACE(ch)) {
         ch = state.input.charCodeAt(++state.position);
       }
 
-      if (0x23/* # */ === ch) {
+      if (ch === 0x23/* # */) {
         do { ch = state.input.charCodeAt(++state.position); }
-        while (0 !== ch && !is_EOL(ch));
+        while (ch !== 0 && !is_EOL(ch));
         break;
       }
 
-      if (is_EOL(ch)) {
-        break;
-      }
+      if (is_EOL(ch)) break;
 
       _position = state.position;
 
-      while (0 !== ch && !is_WS_OR_EOL(ch)) {
+      while (ch !== 0 && !is_WS_OR_EOL(ch)) {
         ch = state.input.charCodeAt(++state.position);
       }
 
       directiveArgs.push(state.input.slice(_position, state.position));
     }
 
-    if (0 !== ch) {
-      readLineBreak(state);
-    }
+    if (ch !== 0) readLineBreak(state);
 
     if (_hasOwnProperty.call(directiveHandlers, directiveName)) {
       directiveHandlers[directiveName](state, directiveName, directiveArgs);
@@ -2482,10 +2434,10 @@ function readDocument(state) {
 
   skipSeparationSpace(state, true, -1);
 
-  if (0 === state.lineIndent &&
-      0x2D/* - */ === state.input.charCodeAt(state.position) &&
-      0x2D/* - */ === state.input.charCodeAt(state.position + 1) &&
-      0x2D/* - */ === state.input.charCodeAt(state.position + 2)) {
+  if (state.lineIndent === 0 &&
+      state.input.charCodeAt(state.position)     === 0x2D/* - */ &&
+      state.input.charCodeAt(state.position + 1) === 0x2D/* - */ &&
+      state.input.charCodeAt(state.position + 2) === 0x2D/* - */) {
     state.position += 3;
     skipSeparationSpace(state, true, -1);
 
@@ -2505,7 +2457,7 @@ function readDocument(state) {
 
   if (state.position === state.lineStart && testDocumentSeparator(state)) {
 
-    if (0x2E/* . */ === state.input.charCodeAt(state.position)) {
+    if (state.input.charCodeAt(state.position) === 0x2E/* . */) {
       state.position += 3;
       skipSeparationSpace(state, true, -1);
     }
@@ -2527,8 +2479,8 @@ function loadDocuments(input, options) {
   if (input.length !== 0) {
 
     // Add tailing `\n` if not exists
-    if (0x0A/* LF */ !== input.charCodeAt(input.length - 1) &&
-        0x0D/* CR */ !== input.charCodeAt(input.length - 1)) {
+    if (input.charCodeAt(input.length - 1) !== 0x0A/* LF */ &&
+        input.charCodeAt(input.length - 1) !== 0x0D/* CR */) {
       input += '\n';
     }
 
@@ -2543,7 +2495,7 @@ function loadDocuments(input, options) {
   // Use 0 as string terminator. That significantly simplifies bounds check.
   state.input += '\0';
 
-  while (0x20/* Space */ === state.input.charCodeAt(state.position)) {
+  while (state.input.charCodeAt(state.position) === 0x20/* Space */) {
     state.lineIndent += 1;
     state.position += 1;
   }
@@ -2568,10 +2520,10 @@ function loadAll(input, iterator, options) {
 function load(input, options) {
   var documents = loadDocuments(input, options);
 
-  if (0 === documents.length) {
+  if (documents.length === 0) {
     /*eslint-disable no-undefined*/
     return undefined;
-  } else if (1 === documents.length) {
+  } else if (documents.length === 1) {
     return documents[0];
   }
   throw new YAMLException('expected a single document in the stream, but found more');
@@ -2612,9 +2564,7 @@ function Mark(name, buffer, position, line, column) {
 Mark.prototype.getSnippet = function getSnippet(indent, maxLength) {
   var head, start, tail, end, snippet;
 
-  if (!this.buffer) {
-    return null;
-  }
+  if (!this.buffer) return null;
 
   indent = indent || 4;
   maxLength = maxLength || 75;
@@ -2622,7 +2572,7 @@ Mark.prototype.getSnippet = function getSnippet(indent, maxLength) {
   head = '';
   start = this.position;
 
-  while (start > 0 && -1 === '\x00\r\n\x85\u2028\u2029'.indexOf(this.buffer.charAt(start - 1))) {
+  while (start > 0 && '\x00\r\n\x85\u2028\u2029'.indexOf(this.buffer.charAt(start - 1)) === -1) {
     start -= 1;
     if (this.position - start > (maxLength / 2 - 1)) {
       head = ' ... ';
@@ -2634,7 +2584,7 @@ Mark.prototype.getSnippet = function getSnippet(indent, maxLength) {
   tail = '';
   end = this.position;
 
-  while (end < this.buffer.length && -1 === '\x00\r\n\x85\u2028\u2029'.indexOf(this.buffer.charAt(end))) {
+  while (end < this.buffer.length && '\x00\r\n\x85\u2028\u2029'.indexOf(this.buffer.charAt(end)) === -1) {
     end += 1;
     if (end - this.position > (maxLength / 2 - 1)) {
       tail = ' ... ';
@@ -2701,7 +2651,7 @@ function compileList(schema, name, result) {
   });
 
   return result.filter(function (type, index) {
-    return -1 === exclude.indexOf(index);
+    return exclude.indexOf(index) === -1;
   });
 }
 
@@ -2727,7 +2677,7 @@ function Schema(definition) {
   this.explicit = definition.explicit || [];
 
   this.implicit.forEach(function (type) {
-    if (type.loadKind && 'scalar' !== type.loadKind) {
+    if (type.loadKind && type.loadKind !== 'scalar') {
       throw new YAMLException('There is a non-scalar type in the implicit list of a schema. Implicit resolving of such types is not supported.');
     }
   });
@@ -2745,18 +2695,18 @@ Schema.create = function createSchema() {
   var schemas, types;
 
   switch (arguments.length) {
-  case 1:
-    schemas = Schema.DEFAULT;
-    types = arguments[0];
-    break;
+    case 1:
+      schemas = Schema.DEFAULT;
+      types = arguments[0];
+      break;
 
-  case 2:
-    schemas = arguments[0];
-    types = arguments[1];
-    break;
+    case 2:
+      schemas = arguments[0];
+      types = arguments[1];
+      break;
 
-  default:
-    throw new YAMLException('Wrong number of arguments for Schema.create function');
+    default:
+      throw new YAMLException('Wrong number of arguments for Schema.create function');
   }
 
   schemas = common.toArray(schemas);
@@ -2927,7 +2877,7 @@ var YAML_NODE_KINDS = [
 function compileStyleAliases(map) {
   var result = {};
 
-  if (null !== map) {
+  if (map !== null) {
     Object.keys(map).forEach(function (style) {
       map[style].forEach(function (alias) {
         result[String(alias)] = style;
@@ -2942,7 +2892,7 @@ function Type(tag, options) {
   options = options || {};
 
   Object.keys(options).forEach(function (name) {
-    if (-1 === TYPE_CONSTRUCTOR_OPTIONS.indexOf(name)) {
+    if (TYPE_CONSTRUCTOR_OPTIONS.indexOf(name) === -1) {
       throw new YAMLException('Unknown option "' + name + '" is met in definition of "' + tag + '" YAML type.');
     }
   });
@@ -2958,7 +2908,7 @@ function Type(tag, options) {
   this.defaultStyle = options['defaultStyle'] || null;
   this.styleAliases = compileStyleAliases(options['styleAliases'] || null);
 
-  if (-1 === YAML_NODE_KINDS.indexOf(this.kind)) {
+  if (YAML_NODE_KINDS.indexOf(this.kind) === -1) {
     throw new YAMLException('Unknown kind "' + this.kind + '" is specified for "' + tag + '" YAML type.');
   }
 }
@@ -2981,9 +2931,7 @@ var BASE64_MAP = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789
 
 
 function resolveYamlBinary(data) {
-  if (null === data) {
-    return false;
-  }
+  if (data === null) return false;
 
   var code, idx, bitlen = 0, max = data.length, map = BASE64_MAP;
 
@@ -2992,10 +2940,10 @@ function resolveYamlBinary(data) {
     code = map.indexOf(data.charAt(idx));
 
     // Skip CR/LF
-    if (code > 64) { continue; }
+    if (code > 64) continue;
 
     // Fail on illegal characters
-    if (code < 0) { return false; }
+    if (code < 0) return false;
 
     bitlen += 6;
   }
@@ -3040,9 +2988,7 @@ function constructYamlBinary(data) {
   }
 
   // Wrap into Buffer for NodeJS and leave Array for browser
-  if (NodeBuffer) {
-    return new NodeBuffer(result);
-  }
+  if (NodeBuffer) return new NodeBuffer(result);
 
   return result;
 }
@@ -3107,9 +3053,7 @@ module.exports = new Type('tag:yaml.org,2002:binary', {
 var Type = require('../type');
 
 function resolveYamlBoolean(data) {
-  if (null === data) {
-    return false;
-  }
+  if (data === null) return false;
 
   var max = data.length;
 
@@ -3124,7 +3068,7 @@ function constructYamlBoolean(data) {
 }
 
 function isBoolean(object) {
-  return '[object Boolean]' === Object.prototype.toString.call(object);
+  return Object.prototype.toString.call(object) === '[object Boolean]';
 }
 
 module.exports = new Type('tag:yaml.org,2002:bool', {
@@ -3154,13 +3098,10 @@ var YAML_FLOAT_PATTERN = new RegExp(
   '|\\.(?:nan|NaN|NAN))$');
 
 function resolveYamlFloat(data) {
-  if (null === data) {
-    return false;
-  }
+  if (data === null) return false;
+
+  if (!YAML_FLOAT_PATTERN.test(data)) return false;
 
-  if (!YAML_FLOAT_PATTERN.test(data)) {
-    return false;
-  }
   return true;
 }
 
@@ -3168,20 +3109,20 @@ function constructYamlFloat(data) {
   var value, sign, base, digits;
 
   value  = data.replace(/_/g, '').toLowerCase();
-  sign   = '-' === value[0] ? -1 : 1;
+  sign   = value[0] === '-' ? -1 : 1;
   digits = [];
 
-  if (0 <= '+-'.indexOf(value[0])) {
+  if ('+-'.indexOf(value[0]) >= 0) {
     value = value.slice(1);
   }
 
-  if ('.inf' === value) {
-    return (1 === sign) ? Number.POSITIVE_INFINITY : Number.NEGATIVE_INFINITY;
+  if (value === '.inf') {
+    return (sign === 1) ? Number.POSITIVE_INFINITY : Number.NEGATIVE_INFINITY;
 
-  } else if ('.nan' === value) {
+  } else if (value === '.nan') {
     return NaN;
 
-  } else if (0 <= value.indexOf(':')) {
+  } else if (value.indexOf(':') >= 0) {
     value.split(':').forEach(function (v) {
       digits.unshift(parseFloat(v, 10));
     });
@@ -3208,30 +3149,21 @@ function representYamlFloat(object, style) {
 
   if (isNaN(object)) {
     switch (style) {
-    case 'lowercase':
-      return '.nan';
-    case 'uppercase':
-      return '.NAN';
-    case 'camelcase':
-      return '.NaN';
+      case 'lowercase': return '.nan';
+      case 'uppercase': return '.NAN';
+      case 'camelcase': return '.NaN';
     }
   } else if (Number.POSITIVE_INFINITY === object) {
     switch (style) {
-    case 'lowercase':
-      return '.inf';
-    case 'uppercase':
-      return '.INF';
-    case 'camelcase':
-      return '.Inf';
+      case 'lowercase': return '.inf';
+      case 'uppercase': return '.INF';
+      case 'camelcase': return '.Inf';
     }
   } else if (Number.NEGATIVE_INFINITY === object) {
     switch (style) {
-    case 'lowercase':
-      return '-.inf';
-    case 'uppercase':
-      return '-.INF';
-    case 'camelcase':
-      return '-.Inf';
+      case 'lowercase': return '-.inf';
+      case 'uppercase': return '-.INF';
+      case 'camelcase': return '-.Inf';
     }
   } else if (common.isNegativeZero(object)) {
     return '-0.0';
@@ -3246,8 +3178,8 @@ function representYamlFloat(object, style) {
 }
 
 function isFloat(object) {
-  return ('[object Number]' === Object.prototype.toString.call(object)) &&
-         (0 !== object % 1 || common.isNegativeZero(object));
+  return (Object.prototype.toString.call(object) === '[object Number]') &&
+         (object % 1 !== 0 || common.isNegativeZero(object));
 }
 
 module.exports = new Type('tag:yaml.org,2002:float', {
@@ -3280,16 +3212,14 @@ function isDecCode(c) {
 }
 
 function resolveYamlInteger(data) {
-  if (null === data) {
-    return false;
-  }
+  if (data === null) return false;
 
   var max = data.length,
       index = 0,
       hasDigits = false,
       ch;
 
-  if (!max) { return false; }
+  if (!max) return false;
 
   ch = data[index];
 
@@ -3300,7 +3230,7 @@ function resolveYamlInteger(data) {
 
   if (ch === '0') {
     // 0
-    if (index + 1 === max) { return true; }
+    if (index + 1 === max) return true;
     ch = data[++index];
 
     // base 2, base 8, base 16
@@ -3311,10 +3241,8 @@ function resolveYamlInteger(data) {
 
       for (; index < max; index++) {
         ch = data[index];
-        if (ch === '_') { continue; }
-        if (ch !== '0' && ch !== '1') {
-          return false;
-        }
+        if (ch === '_') continue;
+        if (ch !== '0' && ch !== '1') return false;
         hasDigits = true;
       }
       return hasDigits;
@@ -3327,10 +3255,8 @@ function resolveYamlInteger(data) {
 
       for (; index < max; index++) {
         ch = data[index];
-        if (ch === '_') { continue; }
-        if (!isHexCode(data.charCodeAt(index))) {
-          return false;
-        }
+        if (ch === '_') continue;
+        if (!isHexCode(data.charCodeAt(index))) return false;
         hasDigits = true;
       }
       return hasDigits;
@@ -3339,10 +3265,8 @@ function resolveYamlInteger(data) {
     // base 8
     for (; index < max; index++) {
       ch = data[index];
-      if (ch === '_') { continue; }
-      if (!isOctCode(data.charCodeAt(index))) {
-        return false;
-      }
+      if (ch === '_') continue;
+      if (!isOctCode(data.charCodeAt(index))) return false;
       hasDigits = true;
     }
     return hasDigits;
@@ -3352,18 +3276,18 @@ function resolveYamlInteger(data) {
 
   for (; index < max; index++) {
     ch = data[index];
-    if (ch === '_') { continue; }
-    if (ch === ':') { break; }
+    if (ch === '_') continue;
+    if (ch === ':') break;
     if (!isDecCode(data.charCodeAt(index))) {
       return false;
     }
     hasDigits = true;
   }
 
-  if (!hasDigits) { return false; }
+  if (!hasDigits) return false;
 
   // if !base60 - done;
-  if (ch !== ':') { return true; }
+  if (ch !== ':') return true;
 
   // base60 almost not used, no needs to optimize
   return /^(:[0-5]?[0-9])+$/.test(data.slice(index));
@@ -3379,24 +3303,17 @@ function constructYamlInteger(data) {
   ch = value[0];
 
   if (ch === '-' || ch === '+') {
-    if (ch === '-') { sign = -1; }
+    if (ch === '-') sign = -1;
     value = value.slice(1);
     ch = value[0];
   }
 
-  if ('0' === value) {
-    return 0;
-  }
+  if (value === '0') return 0;
 
   if (ch === '0') {
-    if (value[1] === 'b') {
-      return sign * parseInt(value.slice(2), 2);
-    }
-    if (value[1] === 'x') {
-      return sign * parseInt(value, 16);
-    }
+    if (value[1] === 'b') return sign * parseInt(value.slice(2), 2);
+    if (value[1] === 'x') return sign * parseInt(value, 16);
     return sign * parseInt(value, 8);
-
   }
 
   if (value.indexOf(':') !== -1) {
@@ -3420,8 +3337,8 @@ function constructYamlInteger(data) {
 }
 
 function isInteger(object) {
-  return ('[object Number]' === Object.prototype.toString.call(object)) &&
-         (0 === object % 1 && !common.isNegativeZero(object));
+  return (Object.prototype.toString.call(object)) === '[object Number]' &&
+         (object % 1 === 0 && !common.isNegativeZero(object));
 }
 
 module.exports = new Type('tag:yaml.org,2002:int', {
@@ -3462,24 +3379,22 @@ try {
   esprima = _require('esprima');
 } catch (_) {
   /*global window */
-  if (typeof window !== 'undefined') { esprima = window.esprima; }
+  if (typeof window !== 'undefined') esprima = window.esprima;
 }
 
 var Type = require('../../type');
 
 function resolveJavascriptFunction(data) {
-  if (null === data) {
-    return false;
-  }
+  if (data === null) return false;
 
   try {
     var source = '(' + data + ')',
         ast    = esprima.parse(source, { range: true });
 
-    if ('Program'             !== ast.type         ||
-        1                     !== ast.body.length  ||
-        'ExpressionStatement' !== ast.body[0].type ||
-        'FunctionExpression'  !== ast.body[0].expression.type) {
+    if (ast.type                    !== 'Program'             ||
+        ast.body.length             !== 1                     ||
+        ast.body[0].type            !== 'ExpressionStatement' ||
+        ast.body[0].expression.type !== 'FunctionExpression') {
       return false;
     }
 
@@ -3497,10 +3412,10 @@ function constructJavascriptFunction(data) {
       params = [],
       body;
 
-  if ('Program'             !== ast.type         ||
-      1                     !== ast.body.length  ||
-      'ExpressionStatement' !== ast.body[0].type ||
-      'FunctionExpression'  !== ast.body[0].expression.type) {
+  if (ast.type                    !== 'Program'             ||
+      ast.body.length             !== 1                     ||
+      ast.body[0].type            !== 'ExpressionStatement' ||
+      ast.body[0].expression.type !== 'FunctionExpression') {
     throw new Error('Failed to resolve function');
   }
 
@@ -3521,7 +3436,7 @@ function representJavascriptFunction(object /*, style*/) {
 }
 
 function isFunction(object) {
-  return '[object Function]' === Object.prototype.toString.call(object);
+  return Object.prototype.toString.call(object) === '[object Function]';
 }
 
 module.exports = new Type('tag:yaml.org,2002:js/function', {
@@ -3538,13 +3453,8 @@ module.exports = new Type('tag:yaml.org,2002:js/function', {
 var Type = require('../../type');
 
 function resolveJavascriptRegExp(data) {
-  if (null === data) {
-    return false;
-  }
-
-  if (0 === data.length) {
-    return false;
-  }
+  if (data === null) return false;
+  if (data.length === 0) return false;
 
   var regexp = data,
       tail   = /\/([gim]*)$/.exec(data),
@@ -3552,23 +3462,15 @@ function resolveJavascriptRegExp(data) {
 
   // if regexp starts with '/' it can have modifiers and must be properly closed
   // `/foo/gim` - modifiers tail can be maximum 3 chars
-  if ('/' === regexp[0]) {
-    if (tail) {
-      modifiers = tail[1];
-    }
+  if (regexp[0] === '/') {
+    if (tail) modifiers = tail[1];
 
-    if (modifiers.length > 3) { return false; }
+    if (modifiers.length > 3) return false;
     // if expression starts with /, is should be properly terminated
-    if (regexp[regexp.length - modifiers.length - 1] !== '/') { return false; }
-
-    regexp = regexp.slice(1, regexp.length - modifiers.length - 1);
+    if (regexp[regexp.length - modifiers.length - 1] !== '/') return false;
   }
 
-  try {
-    return true;
-  } catch (error) {
-    return false;
-  }
+  return true;
 }
 
 function constructJavascriptRegExp(data) {
@@ -3577,10 +3479,8 @@ function constructJavascriptRegExp(data) {
       modifiers = '';
 
   // `/foo/gim` - tail can be maximum 4 chars
-  if ('/' === regexp[0]) {
-    if (tail) {
-      modifiers = tail[1];
-    }
+  if (regexp[0] === '/') {
+    if (tail) modifiers = tail[1];
     regexp = regexp.slice(1, regexp.length - modifiers.length - 1);
   }
 
@@ -3590,23 +3490,15 @@ function constructJavascriptRegExp(data) {
 function representJavascriptRegExp(object /*, style*/) {
   var result = '/' + object.source + '/';
 
-  if (object.global) {
-    result += 'g';
-  }
-
-  if (object.multiline) {
-    result += 'm';
-  }
-
-  if (object.ignoreCase) {
-    result += 'i';
-  }
+  if (object.global) result += 'g';
+  if (object.multiline) result += 'm';
+  if (object.ignoreCase) result += 'i';
 
   return result;
 }
 
 function isRegExp(object) {
-  return '[object RegExp]' === Object.prototype.toString.call(object);
+  return Object.prototype.toString.call(object) === '[object RegExp]';
 }
 
 module.exports = new Type('tag:yaml.org,2002:js/regexp', {
@@ -3636,7 +3528,7 @@ function representJavascriptUndefined() {
 }
 
 function isUndefined(object) {
-  return 'undefined' === typeof object;
+  return typeof object === 'undefined';
 }
 
 module.exports = new Type('tag:yaml.org,2002:js/undefined', {
@@ -3654,7 +3546,7 @@ var Type = require('../type');
 
 module.exports = new Type('tag:yaml.org,2002:map', {
   kind: 'mapping',
-  construct: function (data) { return null !== data ? data : {}; }
+  construct: function (data) { return data !== null ? data : {}; }
 });
 
 },{"../type":13}],22:[function(require,module,exports){
@@ -3663,7 +3555,7 @@ module.exports = new Type('tag:yaml.org,2002:map', {
 var Type = require('../type');
 
 function resolveYamlMerge(data) {
-  return '<<' === data || null === data;
+  return data === '<<' || data === null;
 }
 
 module.exports = new Type('tag:yaml.org,2002:merge', {
@@ -3677,9 +3569,7 @@ module.exports = new Type('tag:yaml.org,2002:merge', {
 var Type = require('../type');
 
 function resolveYamlNull(data) {
-  if (null === data) {
-    return true;
-  }
+  if (data === null) return true;
 
   var max = data.length;
 
@@ -3692,7 +3582,7 @@ function constructYamlNull() {
 }
 
 function isNull(object) {
-  return null === object;
+  return object === null;
 }
 
 module.exports = new Type('tag:yaml.org,2002:null', {
@@ -3718,9 +3608,7 @@ var _hasOwnProperty = Object.prototype.hasOwnProperty;
 var _toString       = Object.prototype.toString;
 
 function resolveYamlOmap(data) {
-  if (null === data) {
-    return true;
-  }
+  if (data === null) return true;
 
   var objectKeys = [], index, length, pair, pairKey, pairHasKey,
       object = data;
@@ -3729,36 +3617,26 @@ function resolveYamlOmap(data) {
     pair = object[index];
     pairHasKey = false;
 
-    if ('[object Object]' !== _toString.call(pair)) {
-      return false;
-    }
+    if (_toString.call(pair) !== '[object Object]') return false;
 
     for (pairKey in pair) {
       if (_hasOwnProperty.call(pair, pairKey)) {
-        if (!pairHasKey) {
-          pairHasKey = true;
-        } else {
-          return false;
-        }
+        if (!pairHasKey) pairHasKey = true;
+        else return false;
       }
     }
 
-    if (!pairHasKey) {
-      return false;
-    }
+    if (!pairHasKey) return false;
 
-    if (-1 === objectKeys.indexOf(pairKey)) {
-      objectKeys.push(pairKey);
-    } else {
-      return false;
-    }
+    if (objectKeys.indexOf(pairKey) === -1) objectKeys.push(pairKey);
+    else return false;
   }
 
   return true;
 }
 
 function constructYamlOmap(data) {
-  return null !== data ? data : [];
+  return data !== null ? data : [];
 }
 
 module.exports = new Type('tag:yaml.org,2002:omap', {
@@ -3775,9 +3653,7 @@ var Type = require('../type');
 var _toString = Object.prototype.toString;
 
 function resolveYamlPairs(data) {
-  if (null === data) {
-    return true;
-  }
+  if (data === null) return true;
 
   var index, length, pair, keys, result,
       object = data;
@@ -3787,15 +3663,11 @@ function resolveYamlPairs(data) {
   for (index = 0, length = object.length; index < length; index += 1) {
     pair = object[index];
 
-    if ('[object Object]' !== _toString.call(pair)) {
-      return false;
-    }
+    if (_toString.call(pair) !== '[object Object]') return false;
 
     keys = Object.keys(pair);
 
-    if (1 !== keys.length) {
-      return false;
-    }
+    if (keys.length !== 1) return false;
 
     result[index] = [ keys[0], pair[keys[0]] ];
   }
@@ -3804,9 +3676,7 @@ function resolveYamlPairs(data) {
 }
 
 function constructYamlPairs(data) {
-  if (null === data) {
-    return [];
-  }
+  if (data === null) return [];
 
   var index, length, pair, keys, result,
       object = data;
@@ -3837,7 +3707,7 @@ var Type = require('../type');
 
 module.exports = new Type('tag:yaml.org,2002:seq', {
   kind: 'sequence',
-  construct: function (data) { return null !== data ? data : []; }
+  construct: function (data) { return data !== null ? data : []; }
 });
 
 },{"../type":13}],27:[function(require,module,exports){
@@ -3848,17 +3718,13 @@ var Type = require('../type');
 var _hasOwnProperty = Object.prototype.hasOwnProperty;
 
 function resolveYamlSet(data) {
-  if (null === data) {
-    return true;
-  }
+  if (data === null) return true;
 
   var key, object = data;
 
   for (key in object) {
     if (_hasOwnProperty.call(object, key)) {
-      if (null !== object[key]) {
-        return false;
-      }
+      if (object[key] !== null) return false;
     }
   }
 
@@ -3866,7 +3732,7 @@ function resolveYamlSet(data) {
 }
 
 function constructYamlSet(data) {
-  return null !== data ? data : {};
+  return data !== null ? data : {};
 }
 
 module.exports = new Type('tag:yaml.org,2002:set', {
@@ -3882,7 +3748,7 @@ var Type = require('../type');
 
 module.exports = new Type('tag:yaml.org,2002:str', {
   kind: 'scalar',
-  construct: function (data) { return null !== data ? data : ''; }
+  construct: function (data) { return data !== null ? data : ''; }
 });
 
 },{"../type":13}],29:[function(require,module,exports){
@@ -3903,14 +3769,8 @@ var YAML_TIMESTAMP_REGEXP = new RegExp(
   '(?::([0-9][0-9]))?))?)?$');         // [11] tz_minute
 
 function resolveYamlTimestamp(data) {
-  if (null === data) {
-    return false;
-  }
-
-  if (YAML_TIMESTAMP_REGEXP.exec(data) === null) {
-    return false;
-  }
-
+  if (data === null) return false;
+  if (YAML_TIMESTAMP_REGEXP.exec(data) === null) return false;
   return true;
 }
 
@@ -3920,9 +3780,7 @@ function constructYamlTimestamp(data) {
 
   match = YAML_TIMESTAMP_REGEXP.exec(data);
 
-  if (null === match) {
-    throw new Error('Date resolve error');
-  }
+  if (match === null) throw new Error('Date resolve error');
 
   // match: [1] year [2] month [3] day
 
@@ -3954,16 +3812,12 @@ function constructYamlTimestamp(data) {
     tz_hour = +(match[10]);
     tz_minute = +(match[11] || 0);
     delta = (tz_hour * 60 + tz_minute) * 60000; // delta in mili-seconds
-    if ('-' === match[9]) {
-      delta = -delta;
-    }
+    if (match[9] === '-') delta = -delta;
   }
 
   date = new Date(Date.UTC(year, month, day, hour, minute, second, fraction));
 
-  if (delta) {
-    date.setTime(date.getTime() - delta);
-  }
+  if (delta) date.setTime(date.getTime() - delta);
 
   return date;
 }
diff --git a/dist/js-yaml.min.js b/dist/js-yaml.min.js
index 3082ae5d..9da36310 100644
--- a/dist/js-yaml.min.js
+++ b/dist/js-yaml.min.js
@@ -1,3 +1,3 @@
-/* js-yaml 3.5.2 https://github.com/nodeca/js-yaml */
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