diff --git a/CHANGELOG b/CHANGELOG
index d10a10c..0dd6de4 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,4 +1,10 @@
 
+v0.7.0
+------
+
+BREAKING CHANGE -- .path()/.dotPath(): drop the function's subtree support, fix prototype pollution
+
+
 v0.6.2
 ------
 
diff --git a/browser/tree-kit.js b/browser/tree-kit.js
index 3b758c5..0593995 100644
--- a/browser/tree-kit.js
+++ b/browser/tree-kit.js
@@ -2,7 +2,7 @@
 /*
 	Tree Kit
 
-	Copyright (c) 2014 - 2019 Cédric Ronvel
+	Copyright (c) 2014 - 2021 Cédric Ronvel
 
 	The MIT License (MIT)
 
@@ -31,19 +31,22 @@
 
 // Browser only get the essential of tree-kit, not the unfinished parts of it
 
-var tree = {} ;
+const tree = {} ;
 module.exports = tree ;
 
 
+
 tree.extend = require( './extend.js' ) ;
 tree.clone = require( './clone.js' ) ;
 tree.path = require( './path.js' ) ;
+tree.dotPath = require( './dotPath.js' ) ;
+
 
-},{"./clone.js":2,"./extend.js":3,"./path.js":4}],2:[function(require,module,exports){
+},{"./clone.js":2,"./dotPath.js":3,"./extend.js":4,"./path.js":5}],2:[function(require,module,exports){
 /*
 	Tree Kit
 
-	Copyright (c) 2014 - 2019 Cédric Ronvel
+	Copyright (c) 2014 - 2021 Cédric Ronvel
 
 	The MIT License (MIT)
 
@@ -152,7 +155,312 @@ clone.opaque.set( Date.prototype , src => new Date( src ) ) ;
 /*
 	Tree Kit
 
-	Copyright (c) 2014 - 2019 Cédric Ronvel
+	Copyright (c) 2014 - 2021 Cédric Ronvel
+
+	The MIT License (MIT)
+
+	Permission is hereby granted, free of charge, to any person obtaining a copy
+	of this software and associated documentation files (the "Software"), to deal
+	in the Software without restriction, including without limitation the rights
+	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+	copies of the Software, and to permit persons to whom the Software is
+	furnished to do so, subject to the following conditions:
+
+	The above copyright notice and this permission notice shall be included in all
+	copies or substantial portions of the Software.
+
+	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+	SOFTWARE.
+*/
+
+"use strict" ;
+
+
+
+const dotPath = {} ;
+module.exports = dotPath ;
+
+
+
+const EMPTY_PATH = [] ;
+const PROTO_POLLUTION_MESSAGE = 'This would pollute prototype' ;
+
+
+
+function toPathArray( path ) {
+	if ( Array.isArray( path ) ) { return path ; }
+	else if ( ! path ) { return EMPTY_PATH ; }
+	else if ( typeof path === 'string' ) { return path.split( '.' ) ; }
+
+	throw new TypeError( '[tree.dotPath]: the path argument should be a string or an array' ) ;
+}
+
+
+
+// Walk the tree using the path array.
+function walk( object , pathArray , maxOffset = 0 ) {
+	var i , iMax , key ,
+		pointer = object ;
+
+	for ( i = 0 , iMax = pathArray.length + maxOffset ; i < iMax ; i ++ ) {
+		key = pathArray[ i ] ;
+
+		if ( key === '__proto__' || typeof pointer === 'function' ) { throw new Error( PROTO_POLLUTION_MESSAGE ) ; }
+		if ( ! pointer || typeof pointer !== 'object' ) { return undefined ; }
+
+		pointer = pointer[ key ] ;
+	}
+
+	return pointer ;
+}
+
+
+
+// Walk the tree, create missing element: pave the path up to before the last part of the path.
+// Return that before-the-last element.
+// Object MUST be an object! no check are performed for the first step!
+function pave( object , pathArray ) {
+	var i , iMax , key ,
+		pointer = object ;
+
+	for ( i = 0 , iMax = pathArray.length - 1 ; i < iMax ; i ++ ) {
+		key = pathArray[ i ] ;
+
+		if ( key === '__proto__' || typeof pointer[ key ] === 'function' ) { throw new Error( PROTO_POLLUTION_MESSAGE ) ; }
+		if ( ! pointer[ key ] || typeof pointer[ key ] !== 'object' ) { pointer[ key ] = {} ; }
+
+		pointer = pointer[ key ] ;
+	}
+
+	return pointer ;
+}
+
+
+
+dotPath.get = ( object , path ) => walk( object , toPathArray( path ) ) ;
+
+
+
+dotPath.set = ( object , path , value ) => {
+	if ( ! object || typeof object !== 'object' ) {
+		// Throw?
+		return undefined ;
+	}
+
+	var pathArray = toPathArray( path ) ,
+		key = pathArray[ pathArray.length - 1 ] ;
+
+	if ( key === '__proto__' ) { throw new Error( PROTO_POLLUTION_MESSAGE ) ; }
+
+	var pointer = pave( object , pathArray ) ;
+
+	pointer[ key ] = value ;
+
+	return value ;
+} ;
+
+
+
+dotPath.define = ( object , path , value ) => {
+	if ( ! object || typeof object !== 'object' ) {
+		// Throw?
+		return undefined ;
+	}
+
+	var pathArray = toPathArray( path ) ,
+		key = pathArray[ pathArray.length - 1 ] ;
+
+	if ( key === '__proto__' ) { throw new Error( PROTO_POLLUTION_MESSAGE ) ; }
+
+	var pointer = pave( object , pathArray ) ;
+
+	if ( ! ( key in pointer ) ) { pointer[ key ] = value ; }
+
+	return value ;
+} ;
+
+
+
+dotPath.inc = ( object , path , value ) => {
+	if ( ! object || typeof object !== 'object' ) {
+		// Throw?
+		return undefined ;
+	}
+
+	var pathArray = toPathArray( path ) ,
+		key = pathArray[ pathArray.length - 1 ] ;
+
+	if ( key === '__proto__' ) { throw new Error( PROTO_POLLUTION_MESSAGE ) ; }
+
+	var pointer = pave( object , pathArray ) ;
+
+	if ( typeof pointer[ key ] === 'number' ) { pointer[ key ] ++ ; }
+	else if ( ! pointer[ key ] || typeof pointer[ key ] !== 'object' ) { pointer[ key ] = 1 ; }
+
+	return value ;
+} ;
+
+
+
+dotPath.dec = ( object , path , value ) => {
+	if ( ! object || typeof object !== 'object' ) {
+		// Throw?
+		return undefined ;
+	}
+
+	var pathArray = toPathArray( path ) ,
+		key = pathArray[ pathArray.length - 1 ] ;
+
+	if ( key === '__proto__' ) { throw new Error( PROTO_POLLUTION_MESSAGE ) ; }
+
+	var pointer = pave( object , pathArray ) ;
+
+	if ( typeof pointer[ key ] === 'number' ) { pointer[ key ] -- ; }
+	else if ( ! pointer[ key ] || typeof pointer[ key ] !== 'object' ) { pointer[ key ] = -1 ; }
+
+	return value ;
+} ;
+
+
+
+dotPath.concat = ( object , path , value ) => {
+	if ( ! object || typeof object !== 'object' ) {
+		// Throw?
+		return undefined ;
+	}
+
+	var pathArray = toPathArray( path ) ,
+		key = pathArray[ pathArray.length - 1 ] ;
+
+	if ( key === '__proto__' ) { throw new Error( PROTO_POLLUTION_MESSAGE ) ; }
+
+	var pointer = pave( object , pathArray ) ;
+
+	if ( ! pointer[ key ] ) { pointer[ key ] = value ; }
+	else if ( Array.isArray( pointer[ key ] ) && Array.isArray( value ) ) {
+		pointer[ key ] = pointer[ key ].concat( value ) ;
+	}
+	//else ? do nothing???
+
+	return value ;
+} ;
+
+
+
+dotPath.insert = ( object , path , value ) => {
+	if ( ! object || typeof object !== 'object' ) {
+		// Throw?
+		return undefined ;
+	}
+
+	var pathArray = toPathArray( path ) ,
+		key = pathArray[ pathArray.length - 1 ] ;
+
+	if ( key === '__proto__' ) { throw new Error( PROTO_POLLUTION_MESSAGE ) ; }
+
+	var pointer = pave( object , pathArray ) ;
+
+	if ( ! pointer[ key ] ) { pointer[ key ] = value ; }
+	else if ( Array.isArray( pointer[ key ] ) && Array.isArray( value ) ) {
+		pointer[ key ] = value.concat( pointer[ key ] ) ;
+	}
+	//else ? do nothing???
+
+	return value ;
+} ;
+
+
+
+dotPath.delete = ( object , path ) => {
+	var pathArray = toPathArray( path ) ,
+		key = pathArray[ pathArray.length - 1 ] ;
+
+	if ( key === '__proto__' ) { throw new Error( PROTO_POLLUTION_MESSAGE ) ; }
+
+	var pointer = walk( object , pathArray , -1 ) ;
+
+	if ( ! pointer || typeof pointer !== 'object' ) { return false ; }
+
+	return delete pointer[ key ] ;
+} ;
+
+
+
+dotPath.autoPush = ( object , path , value ) => {
+	if ( ! object || typeof object !== 'object' ) {
+		// Throw?
+		return undefined ;
+	}
+
+	var pathArray = toPathArray( path ) ,
+		key = pathArray[ pathArray.length - 1 ] ;
+
+	if ( key === '__proto__' ) { throw new Error( PROTO_POLLUTION_MESSAGE ) ; }
+
+	var pointer = pave( object , pathArray ) ;
+
+	if ( pointer[ key ] === undefined ) { pointer[ key ] = value ; }
+	else if ( Array.isArray( pointer[ key ] ) ) { pointer[ key ].push( value ) ; }
+	else { pointer[ key ] = [ pointer[ key ] , value ] ; }
+
+	return pointer[ key ] ;
+} ;
+
+
+
+dotPath.append = ( object , path , value ) => {
+	if ( ! object || typeof object !== 'object' ) {
+		// Throw?
+		return undefined ;
+	}
+
+	var pathArray = toPathArray( path ) ,
+		key = pathArray[ pathArray.length - 1 ] ;
+
+	if ( key === '__proto__' ) { throw new Error( PROTO_POLLUTION_MESSAGE ) ; }
+
+	var pointer = pave( object , pathArray ) ;
+
+	if ( ! pointer[ key ] ) { pointer[ key ] = [ value ] ; }
+	else if ( Array.isArray( pointer[ key ] ) ) { pointer[ key ].push( value ) ; }
+	//else ? do nothing???
+
+	return pointer[ key ] ;
+} ;
+
+
+
+dotPath.prepend = ( object , path , value ) => {
+	if ( ! object || typeof object !== 'object' ) {
+		// Throw?
+		return undefined ;
+	}
+
+	var pathArray = toPathArray( path ) ,
+		key = pathArray[ pathArray.length - 1 ] ;
+
+	if ( key === '__proto__' ) { throw new Error( PROTO_POLLUTION_MESSAGE ) ; }
+
+	var pointer = pave( object , pathArray ) ;
+
+	if ( ! pointer[ key ] ) { pointer[ key ] = [ value ] ; }
+	else if ( Array.isArray( pointer[ key ] ) ) { pointer[ key ].unshift( value ) ; }
+	//else ? do nothing???
+
+	return pointer[ key ] ;
+} ;
+
+
+},{}],4:[function(require,module,exports){
+/*
+	Tree Kit
+
+	Copyright (c) 2014 - 2021 Cédric Ronvel
 
 	The MIT License (MIT)
 
@@ -455,11 +763,11 @@ function extendOne( runtime , options , target , source ) {
 }
 
 
-},{}],4:[function(require,module,exports){
+},{}],5:[function(require,module,exports){
 /*
 	Tree Kit
 
-	Copyright (c) 2014 - 2019 Cédric Ronvel
+	Copyright (c) 2014 - 2021 Cédric Ronvel
 
 	The MIT License (MIT)
 
@@ -486,17 +794,19 @@ function extendOne( runtime , options , target , source ) {
 
 
 
-var treePath = {} ;
+const treePath = {} ;
 module.exports = treePath ;
 
 
 
-treePath.op = function op( type , object , path , value ) {
+const PROTO_POLLUTION_MESSAGE = 'This would pollute prototype' ;
+
+
+
+treePath.op = function( type , object , path , value ) {
 	var i , parts , last , pointer , key , isArray = false , pathArrayMode = false , isGenericSet , canBeEmpty = true ;
 
-	if ( ! object || ( typeof object !== 'object' && typeof object !== 'function' ) ) {
-		return ;
-	}
+	if ( ! object || typeof object !== 'object' ) { return ; }
 
 	if ( typeof path === 'string' ) {
 		// Split the path into parts
@@ -544,17 +854,19 @@ treePath.op = function op( type , object , path , value ) {
 		if ( pathArrayMode ) {
 			if ( key === undefined ) {
 				key = parts[ i ] ;
+				if ( key === '__proto__' ) { throw new Error( PROTO_POLLUTION_MESSAGE ) ; }
 				continue ;
 			}
 
-			if ( ! pointer[ key ] || ( typeof pointer[ key ] !== 'object' && typeof pointer[ key ] !== 'function' ) ) {
+			if ( typeof pointer[ key ] === 'function' ) { throw new Error( PROTO_POLLUTION_MESSAGE ) ; }
+			if ( ! pointer[ key ] || typeof pointer[ key ] !== 'object' ) {
 				if ( ! isGenericSet ) { return undefined ; }
 				pointer[ key ] = {} ;
 			}
 
 			pointer = pointer[ key ] ;
 			key = parts[ i ] ;
-
+			if ( key === '__proto__' ) { throw new Error( PROTO_POLLUTION_MESSAGE ) ; }
 			continue ;
 		}
 		else if ( parts[ i ] === '.' ) {
@@ -569,7 +881,8 @@ treePath.op = function op( type , object , path , value ) {
 				key = '' ;
 			}
 
-			if ( ! pointer[ key ] || ( typeof pointer[ key ] !== 'object' && typeof pointer[ key ] !== 'function' ) ) {
+			if ( typeof pointer[ key ] === 'function' ) { throw new Error( PROTO_POLLUTION_MESSAGE ) ; }
+			if ( ! pointer[ key ] || typeof pointer[ key ] !== 'object' ) {
 				if ( ! isGenericSet ) { return undefined ; }
 				pointer[ key ] = {} ;
 			}
@@ -589,6 +902,7 @@ treePath.op = function op( type , object , path , value ) {
 				continue ;
 			}
 
+			if ( typeof pointer[ key ] === 'function' ) { throw new Error( PROTO_POLLUTION_MESSAGE ) ; }
 			if ( ! pointer[ key ] || ! Array.isArray( pointer[ key ] ) ) {
 				if ( ! isGenericSet ) { return undefined ; }
 				pointer[ key ] = [] ;
@@ -606,11 +920,15 @@ treePath.op = function op( type , object , path , value ) {
 
 		canBeEmpty = false ;
 
-		if ( ! isArray ) { key = parts[ i ] ; continue ; }
+		if ( ! isArray ) {
+			key = parts[ i ] ;
+			if ( key === '__proto__' ) { throw new Error( PROTO_POLLUTION_MESSAGE ) ; }
+			continue ;
+		}
 
 		switch ( parts[ i ] ) {
 			case 'length' :
-				key = parts[ i ] ;
+				key = 'length' ;
 				break ;
 
 			// Pseudo-key
@@ -727,7 +1045,7 @@ treePath.prototype = {
 
 
 // Upgrade an object so it can support get, set and delete at its root
-treePath.upgrade = function upgrade( object ) {
+treePath.upgrade = function( object ) {
 	Object.defineProperties( object , {
 		get: { value: treePath.op.bind( undefined , 'get' , object ) } ,
 		delete: { value: treePath.op.bind( undefined , 'delete' , object ) } ,
diff --git a/browser/tree-kit.min.js b/browser/tree-kit.min.js
index 4571aaf..19f89f4 100644
--- a/browser/tree-kit.min.js
+++ b/browser/tree-kit.min.js
@@ -1 +1 @@
-(function(e){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=e()}else if(typeof define==="function"&&define.amd){define([],e)}else{var t;if(typeof window!=="undefined"){t=window}else if(typeof global!=="undefined"){t=global}else if(typeof self!=="undefined"){t=self}else{t=this}t.treeKit=e()}})(function(){var e,t,n;return function(){function e(t,n,r){function i(o,u){if(!n[o]){if(!t[o]){var s="function"==typeof require&&require;if(!u&&s)return s(o,!0);if(f)return f(o,!0);var a=new Error("Cannot find module '"+o+"'");throw a.code="MODULE_NOT_FOUND",a}var c=n[o]={exports:{}};t[o][0].call(c.exports,function(e){var n=t[o][1][e];return i(n||e)},c,c.exports,e,t,n,r)}return n[o].exports}for(var f="function"==typeof require&&require,o=0;o<r.length;o++)i(r[o]);return i}return e}()({1:[function(e,t,n){"use strict";var r={};t.exports=r;r.extend=e("./extend.js");r.clone=e("./clone.js");r.path=e("./path.js")},{"./clone.js":2,"./extend.js":3,"./path.js":4}],2:[function(e,t,n){"use strict";function r(e,t){var n=Object.getPrototypeOf(e);if(r.opaque.has(n)){return r.opaque.get(n)(e)}var i,f,o,u,s,a,c=[{source:e,target:Array.isArray(e)?[]:Object.create(n)}],p=c[0].target,d=new Map;d.set(e,p);while(u=c.shift()){o=Object.getOwnPropertyNames(u.source);for(i=0;i<o.length;i++){f=Object.getOwnPropertyDescriptor(u.source,o[i]);if(!f.value||typeof f.value!=="object"){Object.defineProperty(u.target,o[i],f);continue}s=f.value;if(t){if(d.has(s)){f.value=d.get(s);Object.defineProperty(u.target,o[i],f);continue}}a=Object.getPrototypeOf(f.value);if(r.opaque.has(a)){f.value=r.opaque.get(a)(f.value);Object.defineProperty(u.target,o[i],f);continue}f.value=Array.isArray(s)?[]:Object.create(a);if(t){d.set(s,f.value)}Object.defineProperty(u.target,o[i],f);c.push({source:s,target:f.value})}}return p}t.exports=r;r.opaque=new Map;r.opaque.set(Date.prototype,e=>new Date(e))},{}],3:[function(e,t,n){"use strict";function r(e,t,...n){var r,f,o=false,u=n.length;if(!u){return t}if(!e||typeof e!=="object"){e={}}var s={depth:0,prefix:""};if(e.deep){if(Array.isArray(e.deep)){e.deep=new Set(e.deep)}else if(!(e.deep instanceof Set)){e.deep=true}}if(e.immutables){if(Array.isArray(e.immutables)){e.immutables=new Set(e.immutables)}else if(!(e.immutables instanceof Set)){delete e.immutables}}if(!e.maxDepth&&e.deep&&!e.circular){e.maxDepth=100}if(e.deepFunc){e.deep=true}if(e.flat){e.deep=true;e.proto=false;e.inherit=false;e.unflat=false;if(typeof e.flat!=="string"){e.flat="."}}if(e.unflat){e.deep=false;e.proto=false;e.inherit=false;e.flat=false;if(typeof e.unflat!=="string"){e.unflat="."}}if(e.inherit){e.own=true;e.proto=false}else if(e.proto){e.own=true}if(!t||typeof t!=="object"&&typeof t!=="function"){o=true}if(!e.skipRoot&&(e.inherit||e.proto)){for(r=u-1;r>=0;r--){f=n[r];if(f&&(typeof f==="object"||typeof f==="function")){if(e.inherit){if(o){t=Object.create(f)}else{Object.setPrototypeOf(t,f)}}else if(e.proto){if(o){t=Object.create(Object.getPrototypeOf(f))}else{Object.setPrototypeOf(t,Object.getPrototypeOf(f))}}break}}}else if(o){t={}}s.references={sources:[],targets:[]};for(r=0;r<u;r++){f=n[r];if(!f||typeof f!=="object"&&typeof f!=="function"){continue}i(s,e,t,f)}return t}t.exports=r;function i(e,t,n,r){var f,o,u,s,a,c,p,d,l,b,y,h=-1;if(t.maxDepth&&e.depth>t.maxDepth){throw new Error("[tree] extend(): max depth reached("+t.maxDepth+")")}if(t.circular){e.references.sources.push(r);e.references.targets.push(n)}if(t.own){if(t.nonEnum){u=Object.getOwnPropertyNames(r)}else{u=Object.keys(r)}}else{u=r}for(s in u){if(t.own){s=u[s]}if(s==="__proto__"){continue}if(t.descriptor){d=Object.getOwnPropertyDescriptor(r,s);a=d.value}else{a=r[s]}b=n;l=e.prefix+s;if(t.nofunc&&typeof a==="function"){continue}if(t.unflat&&e.depth===0){y=s.split(t.unflat);o=y.length-1;if(o){for(f=0;f<o;f++){if(!b[y[f]]||typeof b[y[f]]!=="object"&&typeof b[y[f]]!=="function"){b[y[f]]={}}b=b[y[f]]}l=e.prefix+y[o]}}if(t.deep&&a&&(typeof a==="object"||t.deepFunc&&typeof a==="function")&&(!t.descriptor||!d.get)&&((c=Object.getPrototypeOf(a))||true)&&(!(t.deep instanceof Set)||t.deep.has(c))&&(!t.immutables||!t.immutables.has(c))){if(t.circular){h=e.references.sources.indexOf(a)}if(t.flat){if(h>=0){continue}i({depth:e.depth+1,prefix:e.prefix+s+t.flat,references:e.references},t,b,a)}else{if(h>=0){if(t.descriptor){Object.defineProperty(b,l,{value:e.references.targets[h],enumerable:d.enumerable,writable:d.writable,configurable:d.configurable})}else{b[l]=e.references.targets[h]}continue}if(!b[l]||!Object.prototype.hasOwnProperty.call(b,l)||typeof b[l]!=="object"&&typeof b[l]!=="function"){if(Array.isArray(a)){p=[]}else if(t.proto){p=Object.create(c)}else if(t.inherit){p=Object.create(a)}else{p={}}if(t.descriptor){Object.defineProperty(b,l,{value:p,enumerable:d.enumerable,writable:d.writable,configurable:d.configurable})}else{b[l]=p}}else if(t.proto&&Object.getPrototypeOf(b[l])!==c){Object.setPrototypeOf(b[l],c)}else if(t.inherit&&Object.getPrototypeOf(b[l])!==a){Object.setPrototypeOf(b[l],a)}if(t.circular){e.references.sources.push(a);e.references.targets.push(b[l])}i({depth:e.depth+1,prefix:"",references:e.references},t,b[l],a)}}else if(t.preserve&&b[l]!==undefined){continue}else if(!t.inherit){if(t.descriptor){Object.defineProperty(b,l,d)}else{b[l]=a}}if(t.move){delete r[s]}}}},{}],4:[function(e,t,n){"use strict";var r={};t.exports=r;r.op=function e(t,n,r,i){var f,o,u,s,a,c=false,p=false,d,l=true;if(!n||typeof n!=="object"&&typeof n!=="function"){return}if(typeof r==="string"){if(r){o=r.match(/([.#[\]]|[^.#[\]]+)/g)}else{o=[""]}if(o[0]==="."){o.unshift("")}if(o[o.length-1]==="."){o.push("")}}else if(Array.isArray(r)){o=r;p=true}else{throw new TypeError("[tree.path] ."+t+"(): the path argument should be a string or an array")}switch(t){case"get":case"delete":d=false;break;case"set":case"define":case"inc":case"dec":case"append":case"prepend":case"concat":case"insert":case"autoPush":d=true;break;default:throw new TypeError("[tree.path] .op(): wrong type of operation '"+t+"'")}s=n;u=o.length-1;for(f=0;f<=u;f++){if(p){if(a===undefined){a=o[f];continue}if(!s[a]||typeof s[a]!=="object"&&typeof s[a]!=="function"){if(!d){return undefined}s[a]={}}s=s[a];a=o[f];continue}else if(o[f]==="."){c=false;if(a===undefined){if(!l){l=true;continue}a=""}if(!s[a]||typeof s[a]!=="object"&&typeof s[a]!=="function"){if(!d){return undefined}s[a]={}}s=s[a];l=true;continue}else if(o[f]==="#"||o[f]==="["){c=true;l=false;if(a===undefined){if(!Array.isArray(s)){return undefined}continue}if(!s[a]||!Array.isArray(s[a])){if(!d){return undefined}s[a]=[]}s=s[a];continue}else if(o[f]==="]"){l=false;continue}l=false;if(!c){a=o[f];continue}switch(o[f]){case"length":a=o[f];break;case"first":a=0;break;case"last":a=s.length-1;if(a<0){a=0}break;case"next":if(!d){return undefined}a=s.length;break;case"insert":if(!d){return undefined}s.unshift(undefined);a=0;break;default:a=parseInt(o[f],10)}}switch(t){case"get":return s[a];case"delete":if(c&&typeof a==="number"){s.splice(a,1)}else{delete s[a]}return;case"set":s[a]=i;return s[a];case"define":if(!(a in s)){s[a]=i}return s[a];case"inc":if(typeof s[a]==="number"){s[a]++}else if(!s[a]||typeof s[a]!=="object"){s[a]=1}return s[a];case"dec":if(typeof s[a]==="number"){s[a]--}else if(!s[a]||typeof s[a]!=="object"){s[a]=-1}return s[a];case"append":if(!s[a]){s[a]=[i]}else if(Array.isArray(s[a])){s[a].push(i)}return s[a];case"prepend":if(!s[a]){s[a]=[i]}else if(Array.isArray(s[a])){s[a].unshift(i)}return s[a];case"concat":if(!s[a]){s[a]=i}else if(Array.isArray(s[a])&&Array.isArray(i)){s[a]=s[a].concat(i)}return s[a];case"insert":if(!s[a]){s[a]=i}else if(Array.isArray(s[a])&&Array.isArray(i)){s[a]=i.concat(s[a])}return s[a];case"autoPush":if(s[a]===undefined){s[a]=i}else if(Array.isArray(s[a])){s[a].push(i)}else{s[a]=[s[a],i]}return s[a]}};r.get=r.op.bind(undefined,"get");r.delete=r.op.bind(undefined,"delete");r.set=r.op.bind(undefined,"set");r.define=r.op.bind(undefined,"define");r.inc=r.op.bind(undefined,"inc");r.dec=r.op.bind(undefined,"dec");r.append=r.op.bind(undefined,"append");r.prepend=r.op.bind(undefined,"prepend");r.concat=r.op.bind(undefined,"concat");r.insert=r.op.bind(undefined,"insert");r.autoPush=r.op.bind(undefined,"autoPush");r.prototype={get:function(e){return r.get(this,e)},delete:function(e){return r.delete(this,e)},set:function(e,t){return r.set(this,e,t)},define:function(e,t){return r.define(this,e,t)},inc:function(e,t){return r.inc(this,e,t)},dec:function(e,t){return r.dec(this,e,t)},append:function(e,t){return r.append(this,e,t)},prepend:function(e,t){return r.prepend(this,e,t)},concat:function(e,t){return r.concat(this,e,t)},insert:function(e,t){return r.insert(this,e,t)},autoPush:function(e,t){return r.autoPush(this,e,t)}};r.upgrade=function e(t){Object.defineProperties(t,{get:{value:r.op.bind(undefined,"get",t)},delete:{value:r.op.bind(undefined,"delete",t)},set:{value:r.op.bind(undefined,"set",t)},define:{value:r.op.bind(undefined,"define",t)},inc:{value:r.op.bind(undefined,"inc",t)},dec:{value:r.op.bind(undefined,"dec",t)},append:{value:r.op.bind(undefined,"append",t)},prepend:{value:r.op.bind(undefined,"prepend",t)},concat:{value:r.op.bind(undefined,"concat",t)},insert:{value:r.op.bind(undefined,"insert",t)},autoPush:{value:r.op.bind(undefined,"autoPush",t)}})}},{}]},{},[1])(1)});
\ No newline at end of file
+(function(e){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=e()}else if(typeof define==="function"&&define.amd){define([],e)}else{var t;if(typeof window!=="undefined"){t=window}else if(typeof global!=="undefined"){t=global}else if(typeof self!=="undefined"){t=self}else{t=this}t.treeKit=e()}})(function(){var e,t,r;return function(){function e(t,r,n){function i(f,u){if(!r[f]){if(!t[f]){var a="function"==typeof require&&require;if(!u&&a)return a(f,!0);if(o)return o(f,!0);var s=new Error("Cannot find module '"+f+"'");throw s.code="MODULE_NOT_FOUND",s}var c=r[f]={exports:{}};t[f][0].call(c.exports,function(e){var r=t[f][1][e];return i(r||e)},c,c.exports,e,t,r,n)}return r[f].exports}for(var o="function"==typeof require&&require,f=0;f<n.length;f++)i(n[f]);return i}return e}()({1:[function(e,t,r){"use strict";const n={};t.exports=n;n.extend=e("./extend.js");n.clone=e("./clone.js");n.path=e("./path.js");n.dotPath=e("./dotPath.js")},{"./clone.js":2,"./dotPath.js":3,"./extend.js":4,"./path.js":5}],2:[function(e,t,r){"use strict";function n(e,t){var r=Object.getPrototypeOf(e);if(n.opaque.has(r)){return n.opaque.get(r)(e)}var i,o,f,u,a,s,c=[{source:e,target:Array.isArray(e)?[]:Object.create(r)}],p=c[0].target,d=new Map;d.set(e,p);while(u=c.shift()){f=Object.getOwnPropertyNames(u.source);for(i=0;i<f.length;i++){o=Object.getOwnPropertyDescriptor(u.source,f[i]);if(!o.value||typeof o.value!=="object"){Object.defineProperty(u.target,f[i],o);continue}a=o.value;if(t){if(d.has(a)){o.value=d.get(a);Object.defineProperty(u.target,f[i],o);continue}}s=Object.getPrototypeOf(o.value);if(n.opaque.has(s)){o.value=n.opaque.get(s)(o.value);Object.defineProperty(u.target,f[i],o);continue}o.value=Array.isArray(a)?[]:Object.create(s);if(t){d.set(a,o.value)}Object.defineProperty(u.target,f[i],o);c.push({source:a,target:o.value})}}return p}t.exports=n;n.opaque=new Map;n.opaque.set(Date.prototype,e=>new Date(e))},{}],3:[function(e,t,r){"use strict";const n={};t.exports=n;const i=[];const o="This would pollute prototype";function f(e){if(Array.isArray(e)){return e}else if(!e){return i}else if(typeof e==="string"){return e.split(".")}throw new TypeError("[tree.dotPath]: the path argument should be a string or an array")}function u(e,t,r=0){var n,i,f,u=e;for(n=0,i=t.length+r;n<i;n++){f=t[n];if(f==="__proto__"||typeof u==="function"){throw new Error(o)}if(!u||typeof u!=="object"){return undefined}u=u[f]}return u}function a(e,t){var r,n,i,f=e;for(r=0,n=t.length-1;r<n;r++){i=t[r];if(i==="__proto__"||typeof f[i]==="function"){throw new Error(o)}if(!f[i]||typeof f[i]!=="object"){f[i]={}}f=f[i]}return f}n.get=((e,t)=>u(e,f(t)));n.set=((e,t,r)=>{if(!e||typeof e!=="object"){return undefined}var n=f(t),i=n[n.length-1];if(i==="__proto__"){throw new Error(o)}var u=a(e,n);u[i]=r;return r});n.define=((e,t,r)=>{if(!e||typeof e!=="object"){return undefined}var n=f(t),i=n[n.length-1];if(i==="__proto__"){throw new Error(o)}var u=a(e,n);if(!(i in u)){u[i]=r}return r});n.inc=((e,t,r)=>{if(!e||typeof e!=="object"){return undefined}var n=f(t),i=n[n.length-1];if(i==="__proto__"){throw new Error(o)}var u=a(e,n);if(typeof u[i]==="number"){u[i]++}else if(!u[i]||typeof u[i]!=="object"){u[i]=1}return r});n.dec=((e,t,r)=>{if(!e||typeof e!=="object"){return undefined}var n=f(t),i=n[n.length-1];if(i==="__proto__"){throw new Error(o)}var u=a(e,n);if(typeof u[i]==="number"){u[i]--}else if(!u[i]||typeof u[i]!=="object"){u[i]=-1}return r});n.concat=((e,t,r)=>{if(!e||typeof e!=="object"){return undefined}var n=f(t),i=n[n.length-1];if(i==="__proto__"){throw new Error(o)}var u=a(e,n);if(!u[i]){u[i]=r}else if(Array.isArray(u[i])&&Array.isArray(r)){u[i]=u[i].concat(r)}return r});n.insert=((e,t,r)=>{if(!e||typeof e!=="object"){return undefined}var n=f(t),i=n[n.length-1];if(i==="__proto__"){throw new Error(o)}var u=a(e,n);if(!u[i]){u[i]=r}else if(Array.isArray(u[i])&&Array.isArray(r)){u[i]=r.concat(u[i])}return r});n.delete=((e,t)=>{var r=f(t),n=r[r.length-1];if(n==="__proto__"){throw new Error(o)}var i=u(e,r,-1);if(!i||typeof i!=="object"){return false}return delete i[n]});n.autoPush=((e,t,r)=>{if(!e||typeof e!=="object"){return undefined}var n=f(t),i=n[n.length-1];if(i==="__proto__"){throw new Error(o)}var u=a(e,n);if(u[i]===undefined){u[i]=r}else if(Array.isArray(u[i])){u[i].push(r)}else{u[i]=[u[i],r]}return u[i]});n.append=((e,t,r)=>{if(!e||typeof e!=="object"){return undefined}var n=f(t),i=n[n.length-1];if(i==="__proto__"){throw new Error(o)}var u=a(e,n);if(!u[i]){u[i]=[r]}else if(Array.isArray(u[i])){u[i].push(r)}return u[i]});n.prepend=((e,t,r)=>{if(!e||typeof e!=="object"){return undefined}var n=f(t),i=n[n.length-1];if(i==="__proto__"){throw new Error(o)}var u=a(e,n);if(!u[i]){u[i]=[r]}else if(Array.isArray(u[i])){u[i].unshift(r)}return u[i]})},{}],4:[function(e,t,r){"use strict";function n(e,t,...r){var n,o,f=false,u=r.length;if(!u){return t}if(!e||typeof e!=="object"){e={}}var a={depth:0,prefix:""};if(e.deep){if(Array.isArray(e.deep)){e.deep=new Set(e.deep)}else if(!(e.deep instanceof Set)){e.deep=true}}if(e.immutables){if(Array.isArray(e.immutables)){e.immutables=new Set(e.immutables)}else if(!(e.immutables instanceof Set)){delete e.immutables}}if(!e.maxDepth&&e.deep&&!e.circular){e.maxDepth=100}if(e.deepFunc){e.deep=true}if(e.flat){e.deep=true;e.proto=false;e.inherit=false;e.unflat=false;if(typeof e.flat!=="string"){e.flat="."}}if(e.unflat){e.deep=false;e.proto=false;e.inherit=false;e.flat=false;if(typeof e.unflat!=="string"){e.unflat="."}}if(e.inherit){e.own=true;e.proto=false}else if(e.proto){e.own=true}if(!t||typeof t!=="object"&&typeof t!=="function"){f=true}if(!e.skipRoot&&(e.inherit||e.proto)){for(n=u-1;n>=0;n--){o=r[n];if(o&&(typeof o==="object"||typeof o==="function")){if(e.inherit){if(f){t=Object.create(o)}else{Object.setPrototypeOf(t,o)}}else if(e.proto){if(f){t=Object.create(Object.getPrototypeOf(o))}else{Object.setPrototypeOf(t,Object.getPrototypeOf(o))}}break}}}else if(f){t={}}a.references={sources:[],targets:[]};for(n=0;n<u;n++){o=r[n];if(!o||typeof o!=="object"&&typeof o!=="function"){continue}i(a,e,t,o)}return t}t.exports=n;function i(e,t,r,n){var o,f,u,a,s,c,p,d,l,y,h,b=-1;if(t.maxDepth&&e.depth>t.maxDepth){throw new Error("[tree] extend(): max depth reached("+t.maxDepth+")")}if(t.circular){e.references.sources.push(n);e.references.targets.push(r)}if(t.own){if(t.nonEnum){u=Object.getOwnPropertyNames(n)}else{u=Object.keys(n)}}else{u=n}for(a in u){if(t.own){a=u[a]}if(a==="__proto__"){continue}if(t.descriptor){d=Object.getOwnPropertyDescriptor(n,a);s=d.value}else{s=n[a]}y=r;l=e.prefix+a;if(t.nofunc&&typeof s==="function"){continue}if(t.unflat&&e.depth===0){h=a.split(t.unflat);f=h.length-1;if(f){for(o=0;o<f;o++){if(!y[h[o]]||typeof y[h[o]]!=="object"&&typeof y[h[o]]!=="function"){y[h[o]]={}}y=y[h[o]]}l=e.prefix+h[f]}}if(t.deep&&s&&(typeof s==="object"||t.deepFunc&&typeof s==="function")&&(!t.descriptor||!d.get)&&((c=Object.getPrototypeOf(s))||true)&&(!(t.deep instanceof Set)||t.deep.has(c))&&(!t.immutables||!t.immutables.has(c))){if(t.circular){b=e.references.sources.indexOf(s)}if(t.flat){if(b>=0){continue}i({depth:e.depth+1,prefix:e.prefix+a+t.flat,references:e.references},t,y,s)}else{if(b>=0){if(t.descriptor){Object.defineProperty(y,l,{value:e.references.targets[b],enumerable:d.enumerable,writable:d.writable,configurable:d.configurable})}else{y[l]=e.references.targets[b]}continue}if(!y[l]||!Object.prototype.hasOwnProperty.call(y,l)||typeof y[l]!=="object"&&typeof y[l]!=="function"){if(Array.isArray(s)){p=[]}else if(t.proto){p=Object.create(c)}else if(t.inherit){p=Object.create(s)}else{p={}}if(t.descriptor){Object.defineProperty(y,l,{value:p,enumerable:d.enumerable,writable:d.writable,configurable:d.configurable})}else{y[l]=p}}else if(t.proto&&Object.getPrototypeOf(y[l])!==c){Object.setPrototypeOf(y[l],c)}else if(t.inherit&&Object.getPrototypeOf(y[l])!==s){Object.setPrototypeOf(y[l],s)}if(t.circular){e.references.sources.push(s);e.references.targets.push(y[l])}i({depth:e.depth+1,prefix:"",references:e.references},t,y[l],s)}}else if(t.preserve&&y[l]!==undefined){continue}else if(!t.inherit){if(t.descriptor){Object.defineProperty(y,l,d)}else{y[l]=s}}if(t.move){delete n[a]}}}},{}],5:[function(e,t,r){"use strict";const n={};t.exports=n;const i="This would pollute prototype";n.op=function(e,t,r,n){var o,f,u,a,s,c=false,p=false,d,l=true;if(!t||typeof t!=="object"){return}if(typeof r==="string"){if(r){f=r.match(/([.#[\]]|[^.#[\]]+)/g)}else{f=[""]}if(f[0]==="."){f.unshift("")}if(f[f.length-1]==="."){f.push("")}}else if(Array.isArray(r)){f=r;p=true}else{throw new TypeError("[tree.path] ."+e+"(): the path argument should be a string or an array")}switch(e){case"get":case"delete":d=false;break;case"set":case"define":case"inc":case"dec":case"append":case"prepend":case"concat":case"insert":case"autoPush":d=true;break;default:throw new TypeError("[tree.path] .op(): wrong type of operation '"+e+"'")}a=t;u=f.length-1;for(o=0;o<=u;o++){if(p){if(s===undefined){s=f[o];if(s==="__proto__"){throw new Error(i)}continue}if(typeof a[s]==="function"){throw new Error(i)}if(!a[s]||typeof a[s]!=="object"){if(!d){return undefined}a[s]={}}a=a[s];s=f[o];if(s==="__proto__"){throw new Error(i)}continue}else if(f[o]==="."){c=false;if(s===undefined){if(!l){l=true;continue}s=""}if(typeof a[s]==="function"){throw new Error(i)}if(!a[s]||typeof a[s]!=="object"){if(!d){return undefined}a[s]={}}a=a[s];l=true;continue}else if(f[o]==="#"||f[o]==="["){c=true;l=false;if(s===undefined){if(!Array.isArray(a)){return undefined}continue}if(typeof a[s]==="function"){throw new Error(i)}if(!a[s]||!Array.isArray(a[s])){if(!d){return undefined}a[s]=[]}a=a[s];continue}else if(f[o]==="]"){l=false;continue}l=false;if(!c){s=f[o];if(s==="__proto__"){throw new Error(i)}continue}switch(f[o]){case"length":s="length";break;case"first":s=0;break;case"last":s=a.length-1;if(s<0){s=0}break;case"next":if(!d){return undefined}s=a.length;break;case"insert":if(!d){return undefined}a.unshift(undefined);s=0;break;default:s=parseInt(f[o],10)}}switch(e){case"get":return a[s];case"delete":if(c&&typeof s==="number"){a.splice(s,1)}else{delete a[s]}return;case"set":a[s]=n;return a[s];case"define":if(!(s in a)){a[s]=n}return a[s];case"inc":if(typeof a[s]==="number"){a[s]++}else if(!a[s]||typeof a[s]!=="object"){a[s]=1}return a[s];case"dec":if(typeof a[s]==="number"){a[s]--}else if(!a[s]||typeof a[s]!=="object"){a[s]=-1}return a[s];case"append":if(!a[s]){a[s]=[n]}else if(Array.isArray(a[s])){a[s].push(n)}return a[s];case"prepend":if(!a[s]){a[s]=[n]}else if(Array.isArray(a[s])){a[s].unshift(n)}return a[s];case"concat":if(!a[s]){a[s]=n}else if(Array.isArray(a[s])&&Array.isArray(n)){a[s]=a[s].concat(n)}return a[s];case"insert":if(!a[s]){a[s]=n}else if(Array.isArray(a[s])&&Array.isArray(n)){a[s]=n.concat(a[s])}return a[s];case"autoPush":if(a[s]===undefined){a[s]=n}else if(Array.isArray(a[s])){a[s].push(n)}else{a[s]=[a[s],n]}return a[s]}};n.get=n.op.bind(undefined,"get");n.delete=n.op.bind(undefined,"delete");n.set=n.op.bind(undefined,"set");n.define=n.op.bind(undefined,"define");n.inc=n.op.bind(undefined,"inc");n.dec=n.op.bind(undefined,"dec");n.append=n.op.bind(undefined,"append");n.prepend=n.op.bind(undefined,"prepend");n.concat=n.op.bind(undefined,"concat");n.insert=n.op.bind(undefined,"insert");n.autoPush=n.op.bind(undefined,"autoPush");n.prototype={get:function(e){return n.get(this,e)},delete:function(e){return n.delete(this,e)},set:function(e,t){return n.set(this,e,t)},define:function(e,t){return n.define(this,e,t)},inc:function(e,t){return n.inc(this,e,t)},dec:function(e,t){return n.dec(this,e,t)},append:function(e,t){return n.append(this,e,t)},prepend:function(e,t){return n.prepend(this,e,t)},concat:function(e,t){return n.concat(this,e,t)},insert:function(e,t){return n.insert(this,e,t)},autoPush:function(e,t){return n.autoPush(this,e,t)}};n.upgrade=function(e){Object.defineProperties(e,{get:{value:n.op.bind(undefined,"get",e)},delete:{value:n.op.bind(undefined,"delete",e)},set:{value:n.op.bind(undefined,"set",e)},define:{value:n.op.bind(undefined,"define",e)},inc:{value:n.op.bind(undefined,"inc",e)},dec:{value:n.op.bind(undefined,"dec",e)},append:{value:n.op.bind(undefined,"append",e)},prepend:{value:n.op.bind(undefined,"prepend",e)},concat:{value:n.op.bind(undefined,"concat",e)},insert:{value:n.op.bind(undefined,"insert",e)},autoPush:{value:n.op.bind(undefined,"autoPush",e)}})}},{}]},{},[1])(1)});
\ No newline at end of file
diff --git a/package.json b/package.json
index 81a3551..f241c5a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "tree-kit",
-  "version": "0.6.2",
+  "version": "0.7.0",
   "description": "Tree utilities which provides a full-featured extend and object-cloning facility, and various tools to deal with nested object structures.",
   "main": "lib/tree.js",
   "directories": {