[FIX] qweb: properly display falsy values

While it is not tested, nor documented, the reference QWeb
implementation display the `false` value as "false". So, we have to
adapt the Owl implementation to match that behaviour.

At the same time, this commit uses 'let' instead of 'var' in various places,
to make the compiled code more consistant.

tests/component/__snapshots__/component.test.ts.snap

@@ -8,18 +8,18 @@ exports[`basic widget properties reconciliation alg works for t-foreach in t-for
     let QWeb = this.constructor;
     let parent = context;
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
-    var _2 = scope['state'].s;
+    let vn1 = h('div', p1, c1);
+    let _2 = scope['state'].s;
     if (!_2) { throw new Error('QWeb error: Invalid loop expression')}
-    var _3 = _4 = _2;
+    let _3 = _4 = _2;
     if (!(_2 instanceof Array)) {
         _3 = Object.keys(_2);
         _4 = Object.values(_2);
     }
-    var _length3 = _3.length;
-    const _origScope5 = scope;
+    let _length3 = _3.length;
+    let _origScope5 = scope;
     scope = Object.assign(Object.create(context), scope);
     for (let i1 = 0; i1 < _length3; i1++) {
         scope.section_first = i1 === 0
@@ -27,15 +27,15 @@ exports[`basic widget properties reconciliation alg works for t-foreach in t-for
         scope.section_index = i1
         scope.section = _3[i1]
         scope.section_value = _4[i1]
-        var _6 = scope['section'].blips;
+        let _6 = scope['section'].blips;
         if (!_6) { throw new Error('QWeb error: Invalid loop expression')}
-        var _7 = _8 = _6;
+        let _7 = _8 = _6;
         if (!(_6 instanceof Array)) {
             _7 = Object.keys(_6);
             _8 = Object.values(_6);
         }
-        var _length7 = _7.length;
-        const _origScope9 = scope;
+        let _length7 = _7.length;
+        let _origScope9 = scope;
         scope = Object.assign(Object.create(context), scope);
         for (let i2 = 0; i2 < _length7; i2++) {
             scope.blip_first = i2 === 0
@@ -83,9 +83,9 @@ exports[`basic widget properties t-key on a component with t-if, and a sibling c
     let QWeb = this.constructor;
     let parent = context;
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
+    let vn1 = h('div', p1, c1);
     if (false) {
         const nodeKey2 = 'str';
         // Component 'Child'
@@ -148,9 +148,9 @@ exports[`class and style attributes with t-component dynamic t-att-style is prop
     let QWeb = this.constructor;
     let parent = context;
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
+    let vn1 = h('div', p1, c1);
     // Component 'child'
     const _4 = scope['state'].style;
     let w2 = '__3__' in parent.__owl__.cmap ? parent.__owl__.children[parent.__owl__.cmap['__3__']] : false;
@@ -188,9 +188,9 @@ exports[`class and style attributes with t-component t-att-class is properly add
     let parent = context;
     context.__owl__.refs = context.__owl__.refs || {};
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
+    let vn1 = h('div', p1, c1);
     // Component 'Child'
     const ref4 = \`child\`;
     let _5 = {'a':true};
@@ -228,11 +228,11 @@ exports[`class and style attributes with t-component t-att-class is properly add
     // Template name: \\"Child\\"
     let utils = this.constructor.utils;
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let _7 = {'c':true};
     Object.assign(_7, utils.toObj({d:scope['state'].d}))
     let c8 = [], p8 = {key:8,class:_7};
-    var vn8 = h('span', p8, c8);
+    let vn8 = h('span', p8, c8);
     return vn8;
 }"
 `;
@@ -246,9 +246,9 @@ exports[`class and style attributes with t-component t-att-class is properly add
     let parent = context;
     context.__owl__.refs = context.__owl__.refs || {};
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
+    let vn1 = h('div', p1, c1);
     // Component 'Child'
     const ref4 = \`child\`;
     let _5 = {'a':true};
@@ -286,11 +286,11 @@ exports[`class and style attributes with t-component t-att-class is properly add
     // Template name: \\"Child\\"
     let utils = this.constructor.utils;
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let _7 = {'c':true};
     Object.assign(_7, utils.toObj(scope['state'].d?'d':''))
     let c8 = [], p8 = {key:8,class:_7};
-    var vn8 = h('span', p8, c8);
+    let vn8 = h('span', p8, c8);
     return vn8;
 }"
 `;
@@ -303,18 +303,18 @@ exports[`composition sub components with some state rendered in a loop 1`] = `
     let QWeb = this.constructor;
     let parent = context;
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
-    var _2 = scope['state'].numbers;
+    let vn1 = h('div', p1, c1);
+    let _2 = scope['state'].numbers;
     if (!_2) { throw new Error('QWeb error: Invalid loop expression')}
-    var _3 = _4 = _2;
+    let _3 = _4 = _2;
     if (!(_2 instanceof Array)) {
         _3 = Object.keys(_2);
         _4 = Object.values(_2);
     }
-    var _length3 = _3.length;
-    const _origScope5 = scope;
+    let _length3 = _3.length;
+    let _origScope5 = scope;
     scope = Object.assign(Object.create(context), scope);
     for (let i1 = 0; i1 < _length3; i1++) {
         scope.number_first = i1 === 0
@@ -361,9 +361,9 @@ exports[`composition t-component with dynamic value 1`] = `
     let QWeb = this.constructor;
     let parent = context;
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
+    let vn1 = h('div', p1, c1);
     // Component '{{state.widget}}'
     let w2 = '__3__' in parent.__owl__.cmap ? parent.__owl__.children[parent.__owl__.cmap['__3__']] : false;
     let props2 = {};
@@ -399,9 +399,9 @@ exports[`composition t-component with dynamic value 2 1`] = `
     let QWeb = this.constructor;
     let parent = context;
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
+    let vn1 = h('div', p1, c1);
     // Component 'Widget{{state.widget}}'
     let w2 = '__3__' in parent.__owl__.cmap ? parent.__owl__.children[parent.__owl__.cmap['__3__']] : false;
     let props2 = {};
@@ -437,9 +437,9 @@ exports[`dynamic t-props basic use 1`] = `
     let QWeb = this.constructor;
     let parent = context;
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
+    let vn1 = h('div', p1, c1);
     // Component 'Child'
     let w2 = '__3__' in parent.__owl__.cmap ? parent.__owl__.children[parent.__owl__.cmap['__3__']] : false;
     let props2 = Object.assign({}, scope['some'].obj);
@@ -475,11 +475,11 @@ exports[`other directives with t-component t-on with getter as handler 1`] = `
     let QWeb = this.constructor;
     let parent = context;
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
-    var _2 = scope['state'].counter;
-    if (_2 || _2 === 0) {
+    let vn1 = h('div', p1, c1);
+    let _2 = scope['state'].counter;
+    if (_2 != null) {
         c1.push({text: _2});
     }
     // Component 'Child'
@@ -517,9 +517,9 @@ exports[`other directives with t-component t-on with handler bound to argument 1
     let QWeb = this.constructor;
     let parent = context;
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
+    let vn1 = h('div', p1, c1);
     // Component 'child'
     let args4 = [3];
     let w2 = '__3__' in parent.__owl__.cmap ? parent.__owl__.children[parent.__owl__.cmap['__3__']] : false;
@@ -556,9 +556,9 @@ exports[`other directives with t-component t-on with handler bound to empty obje
     let QWeb = this.constructor;
     let parent = context;
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
+    let vn1 = h('div', p1, c1);
     // Component 'child'
     let args4 = [{}];
     let w2 = '__3__' in parent.__owl__.cmap ? parent.__owl__.children[parent.__owl__.cmap['__3__']] : false;
@@ -595,9 +595,9 @@ exports[`other directives with t-component t-on with handler bound to empty obje
     let QWeb = this.constructor;
     let parent = context;
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
+    let vn1 = h('div', p1, c1);
     // Component 'child'
     let args4 = [{}];
     let w2 = '__3__' in parent.__owl__.cmap ? parent.__owl__.children[parent.__owl__.cmap['__3__']] : false;
@@ -634,9 +634,9 @@ exports[`other directives with t-component t-on with handler bound to object 1`]
     let QWeb = this.constructor;
     let parent = context;
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
+    let vn1 = h('div', p1, c1);
     // Component 'child'
     let args4 = [{val:3}];
     let w2 = '__3__' in parent.__owl__.cmap ? parent.__owl__.children[parent.__owl__.cmap['__3__']] : false;
@@ -673,11 +673,11 @@ exports[`other directives with t-component t-on with inline statement 1`] = `
     let QWeb = this.constructor;
     let parent = context;
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
-    var _2 = scope['state'].counter;
-    if (_2 || _2 === 0) {
+    let vn1 = h('div', p1, c1);
+    let _2 = scope['state'].counter;
+    if (_2 != null) {
         c1.push({text: _2});
     }
     // Component 'Child'
@@ -715,9 +715,9 @@ exports[`other directives with t-component t-on with no handler (only modifiers)
     let QWeb = this.constructor;
     let parent = context;
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
+    let vn1 = h('div', p1, c1);
     // Component 'ComponentA'
     let w2 = '__3__' in parent.__owl__.cmap ? parent.__owl__.children[parent.__owl__.cmap['__3__']] : false;
     let props2 = {};
@@ -753,9 +753,9 @@ exports[`other directives with t-component t-on with prevent and self modifiers
     let QWeb = this.constructor;
     let parent = context;
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
+    let vn1 = h('div', p1, c1);
     // Component 'Child'
     let w2 = '__3__' in parent.__owl__.cmap ? parent.__owl__.children[parent.__owl__.cmap['__3__']] : false;
     let props2 = {};
@@ -791,9 +791,9 @@ exports[`other directives with t-component t-on with self and prevent modifiers
     let QWeb = this.constructor;
     let parent = context;
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
+    let vn1 = h('div', p1, c1);
     // Component 'child'
     let w2 = '__3__' in parent.__owl__.cmap ? parent.__owl__.children[parent.__owl__.cmap['__3__']] : false;
     let props2 = {};
@@ -829,9 +829,9 @@ exports[`other directives with t-component t-on with self modifier 1`] = `
     let QWeb = this.constructor;
     let parent = context;
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
+    let vn1 = h('div', p1, c1);
     // Component 'child'
     let w2 = '__3__' in parent.__owl__.cmap ? parent.__owl__.children[parent.__owl__.cmap['__3__']] : false;
     let props2 = {};
@@ -867,9 +867,9 @@ exports[`other directives with t-component t-on with stop and/or prevent modifie
     let QWeb = this.constructor;
     let parent = context;
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
+    let vn1 = h('div', p1, c1);
     // Component 'child'
     let w2 = '__3__' in parent.__owl__.cmap ? parent.__owl__.children[parent.__owl__.cmap['__3__']] : false;
     let props2 = {};
@@ -902,9 +902,9 @@ exports[`random stuff/miscellaneous can inject values in tagged templates 1`] =
 ) {
     // Template name: \\"__template__2\\"
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
+    let vn1 = h('div', p1, c1);
     this.subTemplates['__template__1'].call(this, Object.assign(Object.create(context), scope), Object.assign({}, extra, {parentNode: c1}));
     return vn1;
 }"
@@ -918,9 +918,9 @@ exports[`random stuff/miscellaneous snapshotting compiled code 1`] = `
     let QWeb = this.constructor;
     let parent = context;
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
+    let vn1 = h('div', p1, c1);
     const nodeKey2 = 'somestring';
     // Component 'child'
     let k4 = \`__4__\` + nodeKey2;
@@ -958,18 +958,18 @@ exports[`random stuff/miscellaneous t-on with handler bound to dynamic argument
     let QWeb = this.constructor;
     let parent = context;
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
-    var _2 = scope['items'];
+    let vn1 = h('div', p1, c1);
+    let _2 = scope['items'];
     if (!_2) { throw new Error('QWeb error: Invalid loop expression')}
-    var _3 = _4 = _2;
+    let _3 = _4 = _2;
     if (!(_2 instanceof Array)) {
         _3 = Object.keys(_2);
         _4 = Object.values(_2);
     }
-    var _length3 = _3.length;
-    const _origScope5 = scope;
+    let _length3 = _3.length;
+    let _origScope5 = scope;
     scope = Object.assign(Object.create(context), scope);
     for (let i1 = 0; i1 < _length3; i1++) {
         scope.item_first = i1 === 0
@@ -1014,10 +1014,10 @@ exports[`t-call handlers are properly bound through a t-call 1`] = `
 ) {
     // Template name: \\"sub\\"
     let utils = this.constructor.utils;
-    var h = this.h;
+    let h = this.h;
     let c1 = extra.parentNode;
     let c2 = [], p2 = {key:2,on:{}};
-    var vn2 = h('p', p2, c2);
+    let vn2 = h('p', p2, c2);
     c1.push(vn2);
     extra.handlers['click__3__'] = extra.handlers['click__3__'] || function (e) {if (!context.__owl__.isMounted){return}utils.getComponent(context)['update'](e);};
     p2.on['click'] = extra.handlers['click__3__'];
@@ -1031,10 +1031,10 @@ exports[`t-call handlers with arguments are properly bound through a t-call 1`]
     // Template name: \\"sub\\"
     let utils = this.constructor.utils;
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = extra.parentNode;
     let c2 = [], p2 = {key:2,on:{}};
-    var vn2 = h('p', p2, c2);
+    let vn2 = h('p', p2, c2);
     c1.push(vn2);
     let args3 = [scope['a']];
     p2.on['click'] = function (e) {if (!context.__owl__.isMounted){return}utils.getComponent(context)['update'](...args3, e);};
@@ -1047,21 +1047,21 @@ exports[`t-model directive .lazy modifier 1`] = `
 ) {
     // Template name: \\"__template__1\\"
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
+    let vn1 = h('div', p1, c1);
     let c2 = [], p2 = {key:2,on:{}};
-    var vn2 = h('input', p2, c2);
+    let vn2 = h('input', p2, c2);
     c1.push(vn2);
     let expr2 = scope['state'];
     p2.props = {value: expr2.text};
     extra.handlers['__3__'] = extra.handlers['__3__'] || ((ev) => {expr2.text = ev.target.value});
     p2.on['change'] = extra.handlers['__3__'];
     let c4 = [], p4 = {key:4};
-    var vn4 = h('span', p4, c4);
+    let vn4 = h('span', p4, c4);
     c1.push(vn4);
-    var _5 = scope['state'].text;
-    if (_5 || _5 === 0) {
+    let _5 = scope['state'].text;
+    if (_5 != null) {
         c4.push({text: _5});
     }
     return vn1;
@@ -1073,21 +1073,21 @@ exports[`t-model directive basic use, on an input 1`] = `
 ) {
     // Template name: \\"__template__1\\"
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
+    let vn1 = h('div', p1, c1);
     let c2 = [], p2 = {key:2,on:{}};
-    var vn2 = h('input', p2, c2);
+    let vn2 = h('input', p2, c2);
     c1.push(vn2);
     let expr2 = scope['state'];
     p2.props = {value: expr2.text};
     extra.handlers['__3__'] = extra.handlers['__3__'] || ((ev) => {expr2.text = ev.target.value});
     p2.on['input'] = extra.handlers['__3__'];
     let c4 = [], p4 = {key:4};
-    var vn4 = h('span', p4, c4);
+    let vn4 = h('span', p4, c4);
     c1.push(vn4);
-    var _5 = scope['state'].text;
-    if (_5 || _5 === 0) {
+    let _5 = scope['state'].text;
+    if (_5 != null) {
         c4.push({text: _5});
     }
     return vn1;
@@ -1099,21 +1099,21 @@ exports[`t-model directive basic use, on another key in component 1`] = `
 ) {
     // Template name: \\"SomeComponent\\"
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
+    let vn1 = h('div', p1, c1);
     let c2 = [], p2 = {key:2,on:{}};
-    var vn2 = h('input', p2, c2);
+    let vn2 = h('input', p2, c2);
     c1.push(vn2);
     let expr2 = scope['some'];
     p2.props = {value: expr2.text};
     extra.handlers['__3__'] = extra.handlers['__3__'] || ((ev) => {expr2.text = ev.target.value});
     p2.on['input'] = extra.handlers['__3__'];
     let c4 = [], p4 = {key:4};
-    var vn4 = h('span', p4, c4);
+    let vn4 = h('span', p4, c4);
     c1.push(vn4);
-    var _5 = scope['some'].text;
-    if (_5 || _5 === 0) {
+    let _5 = scope['some'].text;
+    if (_5 != null) {
         c4.push({text: _5});
     }
     return vn1;
@@ -1125,18 +1125,18 @@ exports[`t-model directive in a t-foreach 1`] = `
 ) {
     // Template name: \\"__template__1\\"
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
-    var _2 = scope['state'];
+    let vn1 = h('div', p1, c1);
+    let _2 = scope['state'];
     if (!_2) { throw new Error('QWeb error: Invalid loop expression')}
-    var _3 = _4 = _2;
+    let _3 = _4 = _2;
     if (!(_2 instanceof Array)) {
         _3 = Object.keys(_2);
         _4 = Object.values(_2);
     }
-    var _length3 = _3.length;
-    const _origScope5 = scope;
+    let _length3 = _3.length;
+    let _origScope5 = scope;
     scope = Object.assign(Object.create(context), scope);
     for (let i1 = 0; i1 < _length3; i1++) {
         scope.thing_first = i1 === 0
@@ -1145,9 +1145,9 @@ exports[`t-model directive in a t-foreach 1`] = `
         scope.thing = _3[i1]
         scope.thing_value = _4[i1]
         const nodeKey6 = scope['thing'].id;
-        var _7 = 'checkbox';
+        let _7 = 'checkbox';
         let c8 = [], p8 = {key:nodeKey6,attrs:{type: _7},on:{}};
-        var vn8 = h('input', p8, c8);
+        let vn8 = h('input', p8, c8);
         c1.push(vn8);
         let expr8 = scope['thing'];
         let k9 = \`__9__\` + nodeKey6;
@@ -1165,11 +1165,11 @@ exports[`t-model directive on a select 1`] = `
 ) {
     // Template name: \\"SomeComponent\\"
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
+    let vn1 = h('div', p1, c1);
     let c2 = [], p2 = {key:2,on:{}};
-    var vn2 = h('select', p2, c2);
+    let vn2 = h('select', p2, c2);
     c1.push(vn2);
     let expr2 = scope['state'];
     p2.props = {value: expr2.color};
@@ -1180,27 +1180,27 @@ exports[`t-model directive on a select 1`] = `
         n.elm.value=expr2.color;
       },
     };
-    var _4 = '';
+    let _4 = '';
     let c5 = [], p5 = {key:5,attrs:{value: _4}};
-    var vn5 = h('option', p5, c5);
+    let vn5 = h('option', p5, c5);
     c2.push(vn5);
     c5.push({text: \`Please select one\`});
-    var _6 = 'red';
+    let _6 = 'red';
     let c7 = [], p7 = {key:7,attrs:{value: _6}};
-    var vn7 = h('option', p7, c7);
+    let vn7 = h('option', p7, c7);
     c2.push(vn7);
     c7.push({text: \`Red\`});
-    var _8 = 'blue';
+    let _8 = 'blue';
     let c9 = [], p9 = {key:9,attrs:{value: _8}};
-    var vn9 = h('option', p9, c9);
+    let vn9 = h('option', p9, c9);
     c2.push(vn9);
     c9.push({text: \`Blue\`});
     let c10 = [], p10 = {key:10};
-    var vn10 = h('span', p10, c10);
+    let vn10 = h('span', p10, c10);
     c1.push(vn10);
     c10.push({text: \`Choice: \`});
-    var _11 = scope['state'].color;
-    if (_11 || _11 === 0) {
+    let _11 = scope['state'].color;
+    if (_11 != null) {
         c10.push({text: _11});
     }
     return vn1;
@@ -1212,21 +1212,21 @@ exports[`t-model directive on a sub state key 1`] = `
 ) {
     // Template name: \\"__template__1\\"
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
+    let vn1 = h('div', p1, c1);
     let c2 = [], p2 = {key:2,on:{}};
-    var vn2 = h('input', p2, c2);
+    let vn2 = h('input', p2, c2);
     c1.push(vn2);
     let expr2 = scope['state'].something;
     p2.props = {value: expr2.text};
     extra.handlers['__3__'] = extra.handlers['__3__'] || ((ev) => {expr2.text = ev.target.value});
     p2.on['input'] = extra.handlers['__3__'];
     let c4 = [], p4 = {key:4};
-    var vn4 = h('span', p4, c4);
+    let vn4 = h('span', p4, c4);
     c1.push(vn4);
-    var _5 = scope['state'].something.text;
-    if (_5 || _5 === 0) {
+    let _5 = scope['state'].something.text;
+    if (_5 != null) {
         c4.push({text: _5});
     }
     return vn1;
@@ -1238,35 +1238,35 @@ exports[`t-model directive on an input type=radio 1`] = `
 ) {
     // Template name: \\"SomeComponent\\"
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
-    var _2 = 'radio';
-    var _3 = 'one';
-    var _4 = 'One';
+    let vn1 = h('div', p1, c1);
+    let _2 = 'radio';
+    let _3 = 'one';
+    let _4 = 'One';
     let c5 = [], p5 = {key:5,attrs:{type: _2,id: _3,value: _4},on:{}};
-    var vn5 = h('input', p5, c5);
+    let vn5 = h('input', p5, c5);
     c1.push(vn5);
     let expr5 = scope['state'];
     p5.props = {checked:expr5.choice === 'One'};
     extra.handlers['__6__'] = extra.handlers['__6__'] || ((ev) => {expr5.choice = ev.target.value});
     p5.on['click'] = extra.handlers['__6__'];
-    var _7 = 'radio';
-    var _8 = 'two';
-    var _9 = 'Two';
+    let _7 = 'radio';
+    let _8 = 'two';
+    let _9 = 'Two';
     let c10 = [], p10 = {key:10,attrs:{type: _7,id: _8,value: _9},on:{}};
-    var vn10 = h('input', p10, c10);
+    let vn10 = h('input', p10, c10);
     c1.push(vn10);
     let expr10 = scope['state'];
     p10.props = {checked:expr10.choice === 'Two'};
     extra.handlers['__11__'] = extra.handlers['__11__'] || ((ev) => {expr10.choice = ev.target.value});
     p10.on['click'] = extra.handlers['__11__'];
     let c12 = [], p12 = {key:12};
-    var vn12 = h('span', p12, c12);
+    let vn12 = h('span', p12, c12);
     c1.push(vn12);
     c12.push({text: \`Choice: \`});
-    var _13 = scope['state'].choice;
-    if (_13 || _13 === 0) {
+    let _13 = scope['state'].choice;
+    if (_13 != null) {
         c12.push({text: _13});
     }
     return vn1;
@@ -1278,19 +1278,19 @@ exports[`t-model directive on an input, type=checkbox 1`] = `
 ) {
     // Template name: \\"SomeComponent\\"
     let scope = Object.create(context);
-    var h = this.h;
+    let h = this.h;
     let c1 = [], p1 = {key:1};
-    var vn1 = h('div', p1, c1);
-    var _2 = 'checkbox';
+    let vn1 = h('div', p1, c1);
+    let _2 = 'checkbox';
     let c3 = [], p3 = {key:3,attrs:{type: _2},on:{}};
-    var vn3 = h('input', p3, c3);
+    let vn3 = h('input', p3, c3);
     c1.push(vn3);
     let expr3 = scope['state'];
     p3.props = {checked: expr3.flag};
     extra.handlers['__4__'] = extra.handlers['__4__'] || ((ev) => {expr3.flag = ev.target.checked});
     p3.on['input'] = extra.handlers['__4__'];
     let c5 = [], p5 = {key:5};
-    var vn5 = h('span', p5, c5);
+    let vn5 = h('span', p5, c5);
     c1.push(vn5);
     if (scope['state'].flag) {
         c5.push({text: \`yes\`});
@@ -1311,7 +1311,7 @@ exports[`top level sub widgets basic use 1`] = `
     let parent = context;
     let scope = Object.create(context);
     let result;
-    var h = this.h;
+    let h = this.h;
     // Component 'Child'
     let w1 = '__2__' in parent.__owl__.cmap ? parent.__owl__.children[parent.__owl__.cmap['__2__']] : false;
     let vn3 = {};
@@ -1350,7 +1350,7 @@ exports[`top level sub widgets can select a sub widget  1`] = `
     let parent = context;
     let scope = Object.create(context);
     let result;
-    var h = this.h;
+    let h = this.h;
     if (scope['env'].flag) {
         // Component 'Child'
         let w1 = '__2__' in parent.__owl__.cmap ? parent.__owl__.children[parent.__owl__.cmap['__2__']] : false;