diff --git a/README.md b/README.md
index c2a951fed..4f5bc8d81 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# lodash-es v4.17.2
+# lodash-es v4.17.3
 
 The [Lodash](https://lodash.com/) library exported as [ES](http://www.ecma-international.org/ecma-262/6.0/) modules.
 
@@ -7,4 +7,4 @@ Generated using [lodash-cli](https://www.npmjs.com/package/lodash-cli):
 $ lodash modularize exports=es -o ./
 ```
 
-See the [package source](https://github.com/lodash/lodash/tree/4.17.2-es) for more details.
+See the [package source](https://github.com/lodash/lodash/tree/4.17.3-es) for more details.
diff --git a/_baseGetTag.js b/_baseGetTag.js
index 8e9663176..61b440a06 100644
--- a/_baseGetTag.js
+++ b/_baseGetTag.js
@@ -20,8 +20,7 @@ function baseGetTag(value) {
   if (value == null) {
     return value === undefined ? undefinedTag : nullTag;
   }
-  value = Object(value);
-  return (symToStringTag && symToStringTag in value)
+  return (symToStringTag && symToStringTag in Object(value))
     ? getRawTag(value)
     : objectToString(value);
 }
diff --git a/_baseIsEqual.js b/_baseIsEqual.js
index 67f274118..3b5aba815 100644
--- a/_baseIsEqual.js
+++ b/_baseIsEqual.js
@@ -1,5 +1,4 @@
 import baseIsEqualDeep from './_baseIsEqualDeep.js';
-import isObject from './isObject.js';
 import isObjectLike from './isObjectLike.js';
 
 /**
@@ -20,7 +19,7 @@ function baseIsEqual(value, other, bitmask, customizer, stack) {
   if (value === other) {
     return true;
   }
-  if (value == null || other == null || (!isObject(value) && !isObjectLike(other))) {
+  if (value == null || other == null || (!isObjectLike(value) && !isObjectLike(other))) {
     return value !== value && other !== other;
   }
   return baseIsEqualDeep(value, other, bitmask, customizer, baseIsEqual, stack);
diff --git a/_baseIsEqualDeep.js b/_baseIsEqualDeep.js
index aa8bd25da..d8c8bf075 100644
--- a/_baseIsEqualDeep.js
+++ b/_baseIsEqualDeep.js
@@ -38,17 +38,12 @@ var hasOwnProperty = objectProto.hasOwnProperty;
 function baseIsEqualDeep(object, other, bitmask, customizer, equalFunc, stack) {
   var objIsArr = isArray(object),
       othIsArr = isArray(other),
-      objTag = arrayTag,
-      othTag = arrayTag;
+      objTag = objIsArr ? arrayTag : getTag(object),
+      othTag = othIsArr ? arrayTag : getTag(other);
+
+  objTag = objTag == argsTag ? objectTag : objTag;
+  othTag = othTag == argsTag ? objectTag : othTag;
 
-  if (!objIsArr) {
-    objTag = getTag(object);
-    objTag = objTag == argsTag ? objectTag : objTag;
-  }
-  if (!othIsArr) {
-    othTag = getTag(other);
-    othTag = othTag == argsTag ? objectTag : othTag;
-  }
   var objIsObj = objTag == objectTag,
       othIsObj = othTag == objectTag,
       isSameTag = objTag == othTag;
diff --git a/_basePick.js b/_basePick.js
index be2da0e44..bf80ff0f4 100644
--- a/_basePick.js
+++ b/_basePick.js
@@ -11,7 +11,6 @@ import hasIn from './hasIn.js';
  * @returns {Object} Returns the new object.
  */
 function basePick(object, paths) {
-  object = Object(object);
   return basePickBy(object, paths, function(value, path) {
     return hasIn(object, path);
   });
diff --git a/_createFlow.js b/_createFlow.js
index 70ce17fcc..8e9708469 100644
--- a/_createFlow.js
+++ b/_createFlow.js
@@ -5,9 +5,6 @@ import getFuncName from './_getFuncName.js';
 import isArray from './isArray.js';
 import isLaziable from './_isLaziable.js';
 
-/** Used as the size to enable large array optimizations. */
-var LARGE_ARRAY_SIZE = 200;
-
 /** Error message constants. */
 var FUNC_ERROR_TEXT = 'Expected a function';
 
@@ -64,8 +61,7 @@ function createFlow(fromRight) {
       var args = arguments,
           value = args[0];
 
-      if (wrapper && args.length == 1 &&
-          isArray(value) && value.length >= LARGE_ARRAY_SIZE) {
+      if (wrapper && args.length == 1 && isArray(value)) {
         return wrapper.plant(value).value();
       }
       var index = 0,
diff --git a/_createRound.js b/_createRound.js
index ab9ec8da7..8b3edab7b 100644
--- a/_createRound.js
+++ b/_createRound.js
@@ -16,7 +16,7 @@ function createRound(methodName) {
   var func = Math[methodName];
   return function(number, precision) {
     number = toNumber(number);
-    precision = nativeMin(toInteger(precision), 292);
+    precision = precision == null ? 0 : nativeMin(toInteger(precision), 292);
     if (precision) {
       // Shift with exponential notation to avoid floating-point issues.
       // See [MDN](https://mdn.io/round#Examples) for more details.
diff --git a/_createWrap.js b/_createWrap.js
index c306ded74..6b05382b7 100644
--- a/_createWrap.js
+++ b/_createWrap.js
@@ -83,7 +83,7 @@ function createWrap(func, bitmask, thisArg, partials, holders, argPos, ary, arit
   thisArg = newData[2];
   partials = newData[3];
   holders = newData[4];
-  arity = newData[9] = newData[9] == null
+  arity = newData[9] = newData[9] === undefined
     ? (isBindKey ? 0 : func.length)
     : nativeMax(newData[9] - length, 0);
 
diff --git a/_assignInDefaults.js b/_customDefaultsAssignIn.js
similarity index 68%
rename from _assignInDefaults.js
rename to _customDefaultsAssignIn.js
index cfee5ac67..0de9339b2 100644
--- a/_assignInDefaults.js
+++ b/_customDefaultsAssignIn.js
@@ -7,7 +7,9 @@ var objectProto = Object.prototype;
 var hasOwnProperty = objectProto.hasOwnProperty;
 
 /**
- * Used by `_.defaults` to customize its `_.assignIn` use.
+ * Used by `_.defaults` to customize its `_.assignIn` use to assign properties
+ * of source objects to the destination object for all destination properties
+ * that resolve to `undefined`.
  *
  * @private
  * @param {*} objValue The destination value.
@@ -16,7 +18,7 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * @param {Object} object The parent object of `objValue`.
  * @returns {*} Returns the value to assign.
  */
-function assignInDefaults(objValue, srcValue, key, object) {
+function customDefaultsAssignIn(objValue, srcValue, key, object) {
   if (objValue === undefined ||
       (eq(objValue, objectProto[key]) && !hasOwnProperty.call(object, key))) {
     return srcValue;
@@ -24,4 +26,4 @@ function assignInDefaults(objValue, srcValue, key, object) {
   return objValue;
 }
 
-export default assignInDefaults;
+export default customDefaultsAssignIn;
diff --git a/_mergeDefaults.js b/_customDefaultsMerge.js
similarity index 69%
rename from _mergeDefaults.js
rename to _customDefaultsMerge.js
index 1e3b7b5a1..63c21c88b 100644
--- a/_mergeDefaults.js
+++ b/_customDefaultsMerge.js
@@ -2,7 +2,8 @@ import baseMerge from './_baseMerge.js';
 import isObject from './isObject.js';
 
 /**
- * Used by `_.defaultsDeep` to customize its `_.merge` use.
+ * Used by `_.defaultsDeep` to customize its `_.merge` use to merge source
+ * objects into destination objects that are passed thru.
  *
  * @private
  * @param {*} objValue The destination value.
@@ -14,14 +15,14 @@ import isObject from './isObject.js';
  *  counterparts.
  * @returns {*} Returns the value to assign.
  */
-function mergeDefaults(objValue, srcValue, key, object, source, stack) {
+function customDefaultsMerge(objValue, srcValue, key, object, source, stack) {
   if (isObject(objValue) && isObject(srcValue)) {
     // Recursively merge objects and arrays (susceptible to call stack limits).
     stack.set(srcValue, objValue);
-    baseMerge(objValue, srcValue, undefined, mergeDefaults, stack);
+    baseMerge(objValue, srcValue, undefined, customDefaultsMerge, stack);
     stack['delete'](srcValue);
   }
   return objValue;
 }
 
-export default mergeDefaults;
+export default customDefaultsMerge;
diff --git a/_customOmitClone.js b/_customOmitClone.js
new file mode 100644
index 000000000..40b5856cc
--- /dev/null
+++ b/_customOmitClone.js
@@ -0,0 +1,16 @@
+import isPlainObject from './isPlainObject.js';
+
+/**
+ * Used by `_.omit` to customize its `_.cloneDeep` use to only clone plain
+ * objects.
+ *
+ * @private
+ * @param {*} value The value to inspect.
+ * @param {string} key The key of the property to inspect.
+ * @returns {*} Returns the uncloned value or `undefined` to defer cloning to `_.cloneDeep`.
+ */
+function customOmitClone(value, key) {
+  return (key !== undefined && isPlainObject(value)) ? undefined : value;
+}
+
+export default customOmitClone;
diff --git a/_equalObjects.js b/_equalObjects.js
index da70dc469..9f304ab7a 100644
--- a/_equalObjects.js
+++ b/_equalObjects.js
@@ -1,4 +1,4 @@
-import keys from './keys.js';
+import getAllKeys from './_getAllKeys.js';
 
 /** Used to compose bitmasks for value comparisons. */
 var COMPARE_PARTIAL_FLAG = 1;
@@ -24,9 +24,9 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  */
 function equalObjects(object, other, bitmask, customizer, equalFunc, stack) {
   var isPartial = bitmask & COMPARE_PARTIAL_FLAG,
-      objProps = keys(object),
+      objProps = getAllKeys(object),
       objLength = objProps.length,
-      othProps = keys(other),
+      othProps = getAllKeys(other),
       othLength = othProps.length;
 
   if (objLength != othLength && !isPartial) {
diff --git a/_getSymbols.js b/_getSymbols.js
index 801893a9a..474442abc 100644
--- a/_getSymbols.js
+++ b/_getSymbols.js
@@ -1,6 +1,12 @@
-import overArg from './_overArg.js';
+import arrayFilter from './_arrayFilter.js';
 import stubArray from './stubArray.js';
 
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/** Built-in value references. */
+var propertyIsEnumerable = objectProto.propertyIsEnumerable;
+
 /* Built-in method references for those with the same name as other `lodash` methods. */
 var nativeGetSymbols = Object.getOwnPropertySymbols;
 
@@ -11,6 +17,14 @@ var nativeGetSymbols = Object.getOwnPropertySymbols;
  * @param {Object} object The object to query.
  * @returns {Array} Returns the array of symbols.
  */
-var getSymbols = nativeGetSymbols ? overArg(nativeGetSymbols, Object) : stubArray;
+var getSymbols = !nativeGetSymbols ? stubArray : function(object) {
+  if (object == null) {
+    return [];
+  }
+  object = Object(object);
+  return arrayFilter(nativeGetSymbols(object), function(symbol) {
+    return propertyIsEnumerable.call(object, symbol);
+  });
+};
 
 export default getSymbols;
diff --git a/_hashHas.js b/_hashHas.js
index 8de3daad2..6db025d8e 100644
--- a/_hashHas.js
+++ b/_hashHas.js
@@ -17,7 +17,7 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  */
 function hashHas(key) {
   var data = this.__data__;
-  return nativeCreate ? data[key] !== undefined : hasOwnProperty.call(data, key);
+  return nativeCreate ? (data[key] !== undefined) : hasOwnProperty.call(data, key);
 }
 
 export default hashHas;
diff --git a/_lazyValue.js b/_lazyValue.js
index 1eac26965..ca2e011d4 100644
--- a/_lazyValue.js
+++ b/_lazyValue.js
@@ -2,9 +2,6 @@ import baseWrapperValue from './_baseWrapperValue.js';
 import getView from './_getView.js';
 import isArray from './isArray.js';
 
-/** Used as the size to enable large array optimizations. */
-var LARGE_ARRAY_SIZE = 200;
-
 /** Used to indicate the type of lazy iteratees. */
 var LAZY_FILTER_FLAG = 1,
     LAZY_MAP_FLAG = 2;
@@ -36,8 +33,7 @@ function lazyValue() {
       resIndex = 0,
       takeCount = nativeMin(length, this.__takeCount__);
 
-  if (!isArr || arrLength < LARGE_ARRAY_SIZE ||
-      (arrLength == length && takeCount == length)) {
+  if (!isArr || (!isRight && arrLength == length && takeCount == length)) {
     return baseWrapperValue(array, this.__actions__);
   }
   var result = [];
diff --git a/defaults.js b/defaults.js
index a460e454a..b27d8818f 100644
--- a/defaults.js
+++ b/defaults.js
@@ -1,7 +1,7 @@
 import apply from './_apply.js';
-import assignInDefaults from './_assignInDefaults.js';
 import assignInWith from './assignInWith.js';
 import baseRest from './_baseRest.js';
+import customDefaultsAssignIn from './_customDefaultsAssignIn.js';
 
 /**
  * Assigns own and inherited enumerable string keyed properties of source
@@ -25,7 +25,7 @@ import baseRest from './_baseRest.js';
  * // => { 'a': 1, 'b': 2 }
  */
 var defaults = baseRest(function(args) {
-  args.push(undefined, assignInDefaults);
+  args.push(undefined, customDefaultsAssignIn);
   return apply(assignInWith, undefined, args);
 });
 
diff --git a/defaultsDeep.js b/defaultsDeep.js
index 10863925e..409383e8f 100644
--- a/defaultsDeep.js
+++ b/defaultsDeep.js
@@ -1,6 +1,6 @@
 import apply from './_apply.js';
 import baseRest from './_baseRest.js';
-import mergeDefaults from './_mergeDefaults.js';
+import customDefaultsMerge from './_customDefaultsMerge.js';
 import mergeWith from './mergeWith.js';
 
 /**
@@ -23,7 +23,7 @@ import mergeWith from './mergeWith.js';
  * // => { 'a': { 'b': 2, 'c': 3 } }
  */
 var defaultsDeep = baseRest(function(args) {
-  args.push(undefined, mergeDefaults);
+  args.push(undefined, customDefaultsMerge);
   return apply(mergeWith, undefined, args);
 });
 
diff --git a/isEqual.js b/isEqual.js
index 2494fa68e..8be0e2ce5 100644
--- a/isEqual.js
+++ b/isEqual.js
@@ -8,7 +8,7 @@ import baseIsEqual from './_baseIsEqual.js';
  * date objects, error objects, maps, numbers, `Object` objects, regexes,
  * sets, strings, symbols, and typed arrays. `Object` objects are compared
  * by their own, not inherited, enumerable properties. Functions and DOM
- * nodes are **not** supported.
+ * nodes are compared by strict equality, i.e. `===`.
  *
  * @static
  * @memberOf _
diff --git a/lodash.default.js b/lodash.default.js
index 159824daf..e33e8d162 100644
--- a/lodash.default.js
+++ b/lodash.default.js
@@ -45,7 +45,7 @@ import toInteger from './toInteger.js';
 import lodash from './wrapperLodash.js';
 
 /** Used as the semantic version number. */
-var VERSION = '4.17.2';
+var VERSION = '4.17.3';
 
 /** Used to compose bitmasks for function metadata. */
 var WRAP_BIND_KEY_FLAG = 2;
@@ -431,14 +431,13 @@ arrayEach(['bind', 'bindKey', 'curry', 'curryRight', 'partial', 'partialRight'],
 // Add `LazyWrapper` methods for `_.drop` and `_.take` variants.
 arrayEach(['drop', 'take'], function(methodName, index) {
   LazyWrapper.prototype[methodName] = function(n) {
-    var filtered = this.__filtered__;
-    if (filtered && !index) {
-      return new LazyWrapper(this);
-    }
     n = n === undefined ? 1 : nativeMax(toInteger(n), 0);
 
-    var result = this.clone();
-    if (filtered) {
+    var result = (this.__filtered__ && !index)
+      ? new LazyWrapper(this)
+      : this.clone();
+
+    if (result.__filtered__) {
       result.__takeCount__ = nativeMin(n, result.__takeCount__);
     } else {
       result.__views__.push({
diff --git a/omit.js b/omit.js
index f23a9ca4a..4657d0c3a 100644
--- a/omit.js
+++ b/omit.js
@@ -3,6 +3,7 @@ import baseClone from './_baseClone.js';
 import baseUnset from './_baseUnset.js';
 import castPath from './_castPath.js';
 import copyObject from './_copyObject.js';
+import customOmitClone from './_customOmitClone.js';
 import flatRest from './_flatRest.js';
 import getAllKeysIn from './_getAllKeysIn.js';
 
@@ -44,7 +45,7 @@ var omit = flatRest(function(object, paths) {
   });
   copyObject(object, getAllKeysIn(object), result);
   if (isDeep) {
-    result = baseClone(result, CLONE_DEEP_FLAG | CLONE_FLAT_FLAG | CLONE_SYMBOLS_FLAG);
+    result = baseClone(result, CLONE_DEEP_FLAG | CLONE_FLAT_FLAG | CLONE_SYMBOLS_FLAG, customOmitClone);
   }
   var length = paths.length;
   while (length--) {
diff --git a/package.json b/package.json
index 7cdba41ab..a4459d54a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lodash-es",
-  "version": "4.17.2",
+  "version": "4.17.3",
   "description": "Lodash exported as ES modules.",
   "keywords": "es6, modules, stdlib, util",
   "homepage": "https://lodash.com/custom-builds",
diff --git a/spread.js b/spread.js
index cf221cfc9..3fb8b2388 100644
--- a/spread.js
+++ b/spread.js
@@ -48,7 +48,7 @@ function spread(func, start) {
   if (typeof func != 'function') {
     throw new TypeError(FUNC_ERROR_TEXT);
   }
-  start = start === undefined ? 0 : nativeMax(toInteger(start), 0);
+  start = start == null ? 0 : nativeMax(toInteger(start), 0);
   return baseRest(function(args) {
     var array = args[start],
         otherArgs = castSlice(args, 0, start);
diff --git a/startsWith.js b/startsWith.js
index 991da7a2d..19ca033fe 100644
--- a/startsWith.js
+++ b/startsWith.js
@@ -28,7 +28,10 @@ import toString from './toString.js';
  */
 function startsWith(string, target, position) {
   string = toString(string);
-  position = baseClamp(toInteger(position), 0, string.length);
+  position = position == null
+    ? 0
+    : baseClamp(toInteger(position), 0, string.length);
+
   target = baseToString(target);
   return string.slice(position, position + target.length) == target;
 }
diff --git a/takeWhile.js b/takeWhile.js
index a1a794d1b..f220a6e5e 100644
--- a/takeWhile.js
+++ b/takeWhile.js
@@ -17,7 +17,7 @@ import baseWhile from './_baseWhile.js';
  *
  * var users = [
  *   { 'user': 'barney',  'active': false },
- *   { 'user': 'fred',    'active': false},
+ *   { 'user': 'fred',    'active': false },
  *   { 'user': 'pebbles', 'active': true }
  * ];
  *
diff --git a/template.js b/template.js
index 07d32c67c..17873472c 100644
--- a/template.js
+++ b/template.js
@@ -1,7 +1,7 @@
-import assignInDefaults from './_assignInDefaults.js';
 import assignInWith from './assignInWith.js';
 import attempt from './attempt.js';
 import baseValues from './_baseValues.js';
+import customDefaultsAssignIn from './_customDefaultsAssignIn.js';
 import escapeStringChar from './_escapeStringChar.js';
 import isError from './isError.js';
 import isIterateeCall from './_isIterateeCall.js';
@@ -141,9 +141,9 @@ function template(string, options, guard) {
     options = undefined;
   }
   string = toString(string);
-  options = assignInWith({}, options, settings, assignInDefaults);
+  options = assignInWith({}, options, settings, customDefaultsAssignIn);
 
-  var imports = assignInWith({}, options.imports, settings.imports, assignInDefaults),
+  var imports = assignInWith({}, options.imports, settings.imports, customDefaultsAssignIn),
       importsKeys = keys(imports),
       importsValues = baseValues(imports, importsKeys);
 
diff --git a/templateSettings.js b/templateSettings.js
index ed9388448..5fe73e97a 100644
--- a/templateSettings.js
+++ b/templateSettings.js
@@ -5,8 +5,8 @@ import reInterpolate from './_reInterpolate.js';
 
 /**
  * By default, the template delimiters used by lodash are like those in
- * embedded Ruby (ERB). Change the following template settings to use
- * alternative delimiters.
+ * embedded Ruby (ERB) as well as ES2015 template strings. Change the
+ * following template settings to use alternative delimiters.
  *
  * @static
  * @memberOf _
diff --git a/toSafeInteger.js b/toSafeInteger.js
index 7dba63c9a..6aecc0ab0 100644
--- a/toSafeInteger.js
+++ b/toSafeInteger.js
@@ -29,7 +29,9 @@ var MAX_SAFE_INTEGER = 9007199254740991;
  * // => 3
  */
 function toSafeInteger(value) {
-  return baseClamp(toInteger(value), -MAX_SAFE_INTEGER, MAX_SAFE_INTEGER);
+  return value
+    ? baseClamp(toInteger(value), -MAX_SAFE_INTEGER, MAX_SAFE_INTEGER)
+    : (value === 0 ? value : 0);
 }
 
 export default toSafeInteger;
diff --git a/wrapperLodash.js b/wrapperLodash.js
index dcd299a9c..afc37d301 100644
--- a/wrapperLodash.js
+++ b/wrapperLodash.js
@@ -29,9 +29,9 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * Shortcut fusion is an optimization to merge iteratee calls; this avoids
  * the creation of intermediate arrays and can greatly reduce the number of
  * iteratee executions. Sections of a chain sequence qualify for shortcut
- * fusion if the section is applied to an array of at least `200` elements
- * and any iteratees accept only one argument. The heuristic for whether a
- * section qualifies for shortcut fusion is subject to change.
+ * fusion if the section is applied to an array and iteratees accept only
+ * one argument. The heuristic for whether a section qualifies for shortcut
+ * fusion is subject to change.
  *
  * Chaining is supported in custom builds as long as the `_#value` method is
  * directly or indirectly included in the build.