refactor: 如果 props.foo === undefind 不是一个合法的属性值，那应该用比 in 更严格的判断

Author: paranoidjk

src/index.js

@@ -310,7 +310,7 @@ export default class InputNumber extends React.Component {
     // https://github.com/ant-design/ant-design/issues/8196
     let value = e.target.value.trim().replace(/。/g, '.');
 
-    if ('decimalSeparator' in this.props) {
+    if (this.props.decimalSeparator !== undefined) {
       value = value.replace(this.props.decimalSeparator, '.');
     }
 
@@ -354,7 +354,7 @@ export default class InputNumber extends React.Component {
   }
 
   getPrecision(value) {
-    if ('precision' in this.props) {
+    if (this.props.precision !== undefined) {
       return this.props.precision;
     }
     const valueString = value.toString();
@@ -374,7 +374,7 @@ export default class InputNumber extends React.Component {
   // if this.props.precision is undefined
   // https://github.com/react-component/input-number/issues/39
   getMaxPrecision(currentValue, ratio = 1) {
-    if ('precision' in this.props) {
+    if (this.props.precision !== undefined) {
       return this.props.precision;
     }
     const { step } = this.props;
@@ -521,7 +521,7 @@ export default class InputNumber extends React.Component {
     if (this.isNotCompleteNumber(num)) {
       return num;
     }
-    if ('precision' in this.props) {
+    if (this.props.precision !== undefined) {
       return Number(Number(num).toFixed(this.props.precision));
     }
     return Number(num);
@@ -702,7 +702,7 @@ export default class InputNumber extends React.Component {
     }
 
     let inputDisplayValueFormat = this.formatWrapper(inputDisplayValue);
-    if ('decimalSeparator' in this.props) {
+    if (this.props.decimalSeparator !== undefined) {
       inputDisplayValueFormat = inputDisplayValueFormat
         .toString()
         .replace('.', this.props.decimalSeparator);