Remove isFunction use.

.internal/baseMergeDeep.js

@@ -6,7 +6,6 @@ import initCloneObject from './initCloneObject.js'
 import isArguments from '../isArguments.js'
 import isArrayLikeObject from '../isArrayLikeObject.js'
 import isBuffer from '../isBuffer.js'
-import isFunction from '../isFunction.js'
 import isObject from '../isObject.js'
 import isPlainObject from '../isPlainObject.js'
 import isTypedArray from '../isTypedArray.js'
@@ -72,7 +71,7 @@ function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, sta
       if (isArguments(objValue)) {
         newValue = toPlainObject(objValue)
       }
-      else if (!isObject(objValue) || (srcIndex && isFunction(objValue))) {
+      else if ((srcIndex && typeof objValue == 'function') || !isObject(objValue)) {
         newValue = initCloneObject(srcValue)
       }
     }

isArrayLike.js

@@ -1,4 +1,3 @@
-import isFunction from './isFunction.js'
 import isLength from './isLength.js'
 
 /**
@@ -25,7 +24,7 @@ import isLength from './isLength.js'
  * // => false
  */
 function isArrayLike(value) {
-  return value != null && isLength(value.length) && !isFunction(value)
+  return value != null && typeof value != 'function' && isLength(value.length)
 }
 
 export default isArrayLike

result.js

@@ -1,5 +1,4 @@
 import castPath from './.internal/castPath.js'
-import isFunction from './isFunction.js'
 import toKey from './.internal/toKey.js'
 
 /**
@@ -46,7 +45,7 @@ function result(object, path, defaultValue) {
       index = length
       value = defaultValue
     }
-    object = isFunction(value) ? value.call(object) : value
+    object = typeof value == 'function' ? value.call(object) : value
   }
   return object
 }

transform.js

@@ -1,7 +1,6 @@
 import arrayEach from './.internal/arrayEach.js'
 import baseForOwn from './.internal/baseForOwn.js'
 import isBuffer from './isBuffer.js'
-import isFunction from './isFunction.js'
 import isObject from './isObject.js'
 import isTypedArray from './isTypedArray.js'
 
@@ -44,7 +43,9 @@ function transform(object, iteratee, accumulator) {
       accumulator = isArr ? new Ctor : []
     }
     else if (isObject(object)) {
-      accumulator = isFunction(Ctor) ? Object.create(Object.getPrototypeOf(object)) : {}
+      accumulator = typeof Ctor == 'function'
+        ? Object.create(Object.getPrototypeOf(object))
+        : {}
     }
     else {
       accumulator = {}