Replace getTag implementation by the one from baseGetTag (remove workarounds) (#4115)

.internal/baseGetTag.js

@@ -1,17 +0,0 @@
-const toString = Object.prototype.toString
-
-/**
- * The base implementation of `getTag` without fallbacks for buggy environments.
- *
- * @private
- * @param {*} value The value to query.
- * @returns {string} Returns the `toStringTag`.
- */
-function baseGetTag(value) {
-  if (value == null) {
-    return value === undefined ? '[object Undefined]' : '[object Null]'
-  }
-  return toString.call(value)  
-}
-
-export default baseGetTag

.internal/baseIsEqualDeep.js

@@ -2,7 +2,7 @@ import Stack from './Stack.js'
 import equalArrays from './equalArrays.js'
 import equalByTag from './equalByTag.js'
 import equalObjects from './equalObjects.js'
-import baseGetTag from './baseGetTag.js'
+import getTag from './getTag.js'
 import isBuffer from '../isBuffer.js'
 import isTypedArray from '../isTypedArray.js'
 
@@ -34,8 +34,8 @@ const hasOwnProperty = Object.prototype.hasOwnProperty
 function baseIsEqualDeep(object, other, bitmask, customizer, equalFunc, stack) {
   let objIsArr = Array.isArray(object)
   const othIsArr = Array.isArray(other)
-  let objTag = objIsArr ? arrayTag : baseGetTag(object)
-  let othTag = othIsArr ? arrayTag : baseGetTag(other)
+  let objTag = objIsArr ? arrayTag : getTag(object)
+  let othTag = othIsArr ? arrayTag : getTag(other)
 
   objTag = objTag == argsTag ? objectTag : objTag
   othTag = othTag == argsTag ? objectTag : othTag

.internal/getTag.js

@@ -1,19 +1,4 @@
-import baseGetTag from './baseGetTag.js'
-
-/** `Object#toString` result references. */
-const dataViewTag = '[object DataView]'
-const mapTag = '[object Map]'
-const objectTag = '[object Object]'
-const promiseTag = '[object Promise]'
-const setTag = '[object Set]'
-const weakMapTag = '[object WeakMap]'
-
-/** Used to detect maps, sets, and weakmaps. */
-const dataViewCtorString = `${DataView}`
-const mapCtorString = `${Map}`
-const promiseCtorString = `${Promise}`
-const setCtorString = `${Set}`
-const weakMapCtorString = `${WeakMap}`
+const toString = Object.prototype.toString
 
 /**
  * Gets the `toStringTag` of `value`.
@@ -22,30 +7,11 @@ const weakMapCtorString = `${WeakMap}`
  * @param {*} value The value to query.
  * @returns {string} Returns the `toStringTag`.
  */
-let getTag = baseGetTag
-
-// Fallback for data views, maps, sets, and weak maps in IE 11 and promises in Node.js < 6.
-if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||
-    (getTag(new Map) != mapTag) ||
-    (getTag(Promise.resolve()) != promiseTag) ||
-    (getTag(new Set) != setTag) ||
-    (getTag(new WeakMap) != weakMapTag)) {
-  getTag = (value) => {
-    const result = baseGetTag(value)
-    const Ctor = result == objectTag ? value.constructor : undefined
-    const ctorString = Ctor ? `${Ctor}` : ''
-
-    if (ctorString) {
-      switch (ctorString) {
-        case dataViewCtorString: return dataViewTag
-        case mapCtorString: return mapTag
-        case promiseCtorString: return promiseTag
-        case setCtorString: return setTag
-        case weakMapCtorString: return weakMapTag
-      }
-    }
-    return result
+function getTag(value) {
+  if (value == null) {
+    return value === undefined ? '[object Undefined]' : '[object Null]'
   }
+  return toString.call(value)  
 }
 
 export default getTag