diff --git a/book2/book2.view.css b/book2/book2.view.css
index 955de3e7fb9..20c6b86dc0b 100644
--- a/book2/book2.view.css
+++ b/book2/book2.view.css
@@ -33,7 +33,7 @@
 	top: 1.5rem;
 	width: 1px;
 	height: 1rem;
-	background: var(--mol_theme_special);
+	background: var(--mol_theme_focus);
 	border-radius: var(--mol_gap_round);
 	opacity: .5;
 }
diff --git a/build/build.node.ts b/build/build.node.ts
index f72e04dbde4..533abcf9977 100644
--- a/build/build.node.ts
+++ b/build/build.node.ts
@@ -696,7 +696,7 @@ namespace $ {
 					try {
 						this.modEnsure( dep.path() )
 					} catch( error: any ) {
-						error.message = `${ error.message }\nDependency "${ dep.relate( this.root() ) }" from "${ mod.relate( this.root() ) }" `
+						error.message = `${ error.message }\nDependency "${p}" -> "${ dep.relate( this.root() ) }" from "${ mod.relate( this.root() ) }" `
 						$mol_fail_hidden(error)
 					}
 					
@@ -905,7 +905,7 @@ namespace $ {
 			var sources = this.sources_js( { path , exclude } )
 			if( sources.length === 0 ) return []
 			
-			var concater = new $mol_sourcemap_builder( targetJS.parent().path(), ';')
+			var concater = new $mol_sourcemap_builder( this.root().relate( targetJS.parent() ), ';')
 			concater.add( '"use strict"' )
 
 			if( bundle === 'node' ) {
@@ -931,7 +931,7 @@ namespace $ {
 							concater.add( `\nvar $node = $node || {}\nvoid function( module ) { var exports = module.${''}exports = this; function require( id ) { return $node[ id.replace( /^.\\// , "` + src.parent().relate( this.root().resolve( 'node_modules' ) ) + `/" ) ] }; \n`, '-' )
 						}
 
-						concater.add( content.text , src.relate( targetJS.parent() ) , content.map )
+						concater.add( content.text , '' , content.map )
 						
 						if( isCommonJs ) {
 							const idFull = src.relate( this.root().resolve( 'node_modules' ) )
@@ -1016,7 +1016,7 @@ namespace $ {
 			var target = pack.resolve( `-/${bundle}.test.js` )
 			var targetMap = pack.resolve( `-/${bundle}.test.js.map` )
 			
-			var concater = new $mol_sourcemap_builder( target.parent().path(), ';')
+			var concater = new $mol_sourcemap_builder( this.root().relate( target.parent() ), ';')
 			concater.add( '"use strict"' )
 			
 			var exclude_ext = exclude.filter( ex => ex !== 'test' && ex !== 'dev' )
@@ -1041,7 +1041,7 @@ namespace $ {
 					}
 					try {
 						const content = this.js_content( src.path() )
-						concater.add( content.text, src.relate( target.parent() ), content.map)
+						concater.add( content.text, '', content.map)
 					} catch( error: any ) {
 						errors.push( error )
 					}
diff --git a/compare/deep/deep.ts b/compare/deep/deep.ts
index 396a243975b..91830cd72cd 100644
--- a/compare/deep/deep.ts
+++ b/compare/deep/deep.ts
@@ -21,10 +21,10 @@ namespace $ {
 		
 		if( left_proto !== right_proto ) return false
 
-		if( left instanceof Boolean ) return Object.is( left.valueOf(), right['valueOf']() )
-		if( left instanceof Number ) return Object.is( left.valueOf(), right['valueOf']() )
-		if( left instanceof String ) return Object.is( left.valueOf(), right['valueOf']() )
-		if( left instanceof Date ) return Object.is( left.valueOf(), right['valueOf']() )
+		if( left instanceof Boolean ) return Object.is( left.valueOf(), ( right as any )['valueOf']() )
+		if( left instanceof Number ) return Object.is( left.valueOf(), ( right as any )['valueOf']() )
+		if( left instanceof String ) return Object.is( left.valueOf(), ( right as any )['valueOf']() )
+		if( left instanceof Date ) return Object.is( left.valueOf(), ( right as any )['valueOf']() )
 		if( left instanceof RegExp ) return left.source === (right as any).source && left.flags === (right as any).flags
 		if( left instanceof Error ) return left.message === (right as any).message && left.stack === (right as any).stack
 
diff --git a/object2/object2.ts b/object2/object2.ts
index 88629a15450..3cd8c4d5457 100644
--- a/object2/object2.ts
+++ b/object2/object2.ts
@@ -2,7 +2,7 @@ namespace $ {
 
 	export class $mol_object2 {
 		
-		static $ = $ as $
+		static $ = $ as any as $
 		
 		[Symbol.toStringTag]!: string
 
@@ -31,7 +31,7 @@ namespace $ {
 		}
 		
 		static toString() {
-			if( Symbol.toStringTag in this ) return this[ Symbol.toStringTag ] as string
+			if( Symbol.toStringTag in this ) return ( this as any )[ Symbol.toStringTag ] as string
 			return this.name
 		}
 		
diff --git a/range2/range2.test.ts b/range2/range2.test.ts
index 7eb0506fae6..6d40adad9d9 100644
--- a/range2/range2.test.ts
+++ b/range2/range2.test.ts
@@ -11,13 +11,13 @@ namespace $ {
 			$mol_assert_ok( list instanceof Array )
 			$mol_assert_equal( list.length , 10 )
 
-			$mol_assert_equal( list[-1] , -1 )
+			$mol_assert_equal( list[-1] , undefined )
 			$mol_assert_equal( list[0] , 0 )
 			$mol_assert_equal( list[9] , 9 )
 			$mol_assert_equal( list[9.5] , undefined )
-			$mol_assert_equal( list[10] , 10 )
+			$mol_assert_equal( list[10] , undefined )
 
-			$mol_assert_equal( calls , 4 )
+			$mol_assert_equal( calls , 2 )
 
 		} ,
 
@@ -32,9 +32,9 @@ namespace $ {
 			$mol_assert_equal( list[0] , 0 )
 			$mol_assert_equal( list[4] , 4 )
 			$mol_assert_equal( list[Number.MAX_SAFE_INTEGER] , Number.MAX_SAFE_INTEGER )
-			$mol_assert_equal( list[Number.POSITIVE_INFINITY] , Number.POSITIVE_INFINITY )
+			$mol_assert_equal( list[Number.POSITIVE_INFINITY] , undefined )
 			
-			$mol_assert_equal( calls , 4 )
+			$mol_assert_equal( calls , 3 )
 
 		} ,
 
@@ -100,10 +100,10 @@ namespace $ {
 			$mol_assert_equal( list[9] , 4 )
 			$mol_assert_equal( list[10] , 0 )
 			$mol_assert_equal( list[14] , 4 )
-			$mol_assert_equal( list[15] , 5 )
+			$mol_assert_equal( list[15] , undefined )
 			
 			$mol_assert_equal( calls1 , 2 )
-			$mol_assert_equal( calls2 , 3 )
+			$mol_assert_equal( calls2 , 2 )
 
 		} ,
 
@@ -118,7 +118,7 @@ namespace $ {
 
 			$mol_assert_equal( list[0] , 1 )
 			$mol_assert_equal( list[2] , 5 )
-			$mol_assert_equal( list[3] , 7 )
+			$mol_assert_equal( list[3] , undefined )
 			
 			$mol_assert_equal( calls , 10 )
 			// $mol_assert_equal( calls , 6 ) // TODO: lazy filter
@@ -128,13 +128,14 @@ namespace $ {
 		'reverse'() {
 			let calls = 0
 
-			const list = $mol_range2( index => ( ++ calls , index ) , ()=> 10 ).reverse().slice(0, 3)
+			const list = $mol_range2( index => ( ++ calls , index ) , ()=> 10 ).toReversed().slice(0, 3)
 
 			$mol_assert_ok( list instanceof Array )
 			$mol_assert_equal( list.length , 3 )
 
 			$mol_assert_equal( list[0] , 9 )
-			$mol_assert_equal( list[3] , 6 )
+			$mol_assert_equal( list[2] , 7 )
+			$mol_assert_equal( list[3] , undefined )
 			$mol_assert_equal( calls , 2 )
 
 		} ,
@@ -170,10 +171,10 @@ namespace $ {
 
 			$mol_assert_equal( target[0] , 10 )
 			$mol_assert_equal( target[4] , 14 )
-			$mol_assert_equal( target[5] , 15 )
+			$mol_assert_equal( target[5] , undefined )
 			
-			$mol_assert_equal( calls1 , 3 )
-			$mol_assert_equal( calls2 , 3 )
+			$mol_assert_equal( calls1 , 2 )
+			$mol_assert_equal( calls2 , 2 )
 
 		} ,
 
@@ -188,9 +189,9 @@ namespace $ {
 
 			$mol_assert_equal( list[0] , 3 )
 			$mol_assert_equal( list[3] , 6 )
-			$mol_assert_equal( list[4] , 7 )
+			$mol_assert_equal( list[4] , undefined )
 			
-			$mol_assert_equal( calls , 3 )
+			$mol_assert_equal( calls , 2 )
 
 		} ,
 
@@ -231,9 +232,9 @@ namespace $ {
 			
 			$mol_assert_equal( list[0] , 12 )
 			$mol_assert_equal( list[3] , 15 )
-			$mol_assert_equal( list[4] , Number.NaN )
+			$mol_assert_equal( list[4] , undefined )
 			
-			$mol_assert_equal( calls , 3 )
+			$mol_assert_equal( calls , 2 )
 
 		} ,
 
@@ -246,9 +247,12 @@ namespace $ {
 			
 			$mol_assert_fail( ()=> list.unshift( 4 ) , TypeError )
 			$mol_assert_fail( ()=> list.shift() , TypeError )
-
+			
 			$mol_assert_fail( ()=> list.splice( 1 , 2 ) , TypeError )
 			$mol_assert_fail( ()=> list[ 1 ] = 2 , TypeError )
+			
+			$mol_assert_fail( ()=> list.reverse() , TypeError )
+			$mol_assert_fail( ()=> list.sort() , TypeError )
 
 			$mol_assert_equal( list.toString() , '0,1,2,3,4' )
 
diff --git a/range2/range2.ts b/range2/range2.ts
index 0ec565e9e16..7c836b2beb4 100644
--- a/range2/range2.ts
+++ b/range2/range2.ts
@@ -15,6 +15,8 @@ namespace $ {
 					if( field === 'length' ) return size()
 					
 					const index = Number( field )
+					if( index < 0 ) return undefined
+					if( index >= size() ) return undefined
 					if( index === Math.trunc( index ) ) return item( index )
 				}
 
@@ -22,7 +24,7 @@ namespace $ {
 			} ,
 
 			set( target , field ) {
-				return $mol_fail( new TypeError( `Lazy range is read only, ${String(field)}` ) )
+				return $mol_fail( new TypeError( `Lazy range is read only (trying to set field ${ JSON.stringify( field ) })`  ) )
 			} ,
 
 			ownKeys( target ) {
@@ -53,8 +55,9 @@ namespace $ {
 	}
 
 	export class $mol_range2_array< Item > extends Array< Item > {
-
-		concat( ... tail : this[] ) : Item[] {
+		
+		// Lazy
+		concat( ... tail : Item[][] ) : Item[] {
 			if( tail.length === 0 ) return this as any
 
 			if( tail.length > 1 ) {
@@ -69,6 +72,7 @@ namespace $ {
 			)
 		}
 
+		// Diligent
 		filter< Context > (
 			check : ( val : Item , index : number , list : Item[] )=> boolean ,
 			context? : Context ,
@@ -81,6 +85,7 @@ namespace $ {
 			return filtered
 		}
 
+		// Diligent
 		forEach< Context > (
 			proceed : ( this : Context , val : Item , index : number , list : Item[] )=> void ,
 			context? : Context,
@@ -88,6 +93,7 @@ namespace $ {
 			for( let [ key , value ] of this.entries() ) proceed.call( context as Context , value , key , this )
 		}
 
+		// Lazy
 		map< Item_out , Context > (
 			proceed : ( this : Context , val : Item , index : number , list : Item[] )=> Item_out ,
 			context? : Context ,
@@ -98,6 +104,7 @@ namespace $ {
 			)
 		}
 
+		// Diligent
 		reduce< Result > (
 			merge : ( result : Result , val : Item , index : number , list : Item[] )=> Result ,
 			result? : Result ,
@@ -115,24 +122,23 @@ namespace $ {
 			return result
 		}
 
-		reverse(): Item[] {
+		// Lazy
+		toReversed(): Item[] {
 			return $mol_range2(
 				index => this[ this.length - 1 - index ] ,
 				()=> this.length ,
 			)
 		}
 
-		slice( from = 0 , to = this.length ) : Item[] {
+		// Lazy
+		slice( from = 0 , to = this.length ) {
 			return $mol_range2(
 				index => this[ from + index ] ,
 				()=> Math.min( to , this.length ) - from ,
 			)
 		}
 
-		at(index: number): Item | undefined {
-			return this[index >= 0 ? index : this.length + index]
-		}
-
+		// Lazy
 		some< Context > (
 			check : ( this : Context , val : Item , index : number , list : Item[] )=> boolean ,
 			context? : Context ,
@@ -143,6 +149,7 @@ namespace $ {
 			return false
 		}
 
+		// Lazy
 		every< Context = null > (
 			check : ( this : Context , val : Item , index : number , list : Item[] )=> boolean ,
 			context? : Context ,
@@ -153,6 +160,14 @@ namespace $ {
 			return true
 		}
 
+		reverse() {
+			return $mol_fail( new TypeError( `Mutable reverse is forbidden. Use toReversed instead.`  ) )
+		}
+
+		sort() {
+			return $mol_fail( new TypeError( `Mutable sort is forbidden. Use toSorted instead.`  ) )
+		}
+
 	}
 
 }
diff --git a/range2/readme.md b/range2/readme.md
index 0a4ac15db9b..63d8f88c20e 100644
--- a/range2/readme.md
+++ b/range2/readme.md
@@ -35,6 +35,7 @@ const array = [ ... range ]
 - concat
 - map
 - slice
+- toReversed
 - some
 - every
 - entries
diff --git a/text/code/code.view.css.ts b/text/code/code.view.css.ts
index ed2df4aefc4..e65d1f93948 100644
--- a/text/code/code.view.css.ts
+++ b/text/code/code.view.css.ts
@@ -5,6 +5,9 @@ namespace $.$$ {
 	$mol_style_define( $mol_text_code, {
 
 		whiteSpace: 'pre-wrap',
+		font: {
+			family: 'monospace',
+		},
 		
 		Rows: {
 			padding: $mol_gap.text,
diff --git a/wire/atom/atom.ts b/wire/atom/atom.ts
index 0ad2d0e60b6..95e185fd24b 100644
--- a/wire/atom/atom.ts
+++ b/wire/atom/atom.ts
@@ -43,7 +43,7 @@ namespace $ {
 			const field = task.name + '()'
 			let dict = Object.getOwnPropertyDescriptor( host ?? task, field )?.value
 			const prefix = (host as any)?.[ Symbol.toStringTag ] ?? ( host instanceof Function ? $$.$mol_func_name( host ) : host )
-			const id = `${ prefix }.${ task.name }(${ $mol_key( key ) })`
+			const id = `${ prefix }.${ task.name }(${ $mol_key( key ).replace( /^"|"$/g, "'" ) })`
 			
 			if( dict ) {
 				const existen = dict.get( id )