fix(input-number): exception when the value is a string with precision set (#6094)

* fix(n-input-number): exception when the value is a string in precision mode

* Apply suggestions from code review

* Update src/input-number/src/utils.ts

---------

Co-authored-by: 07akioni <07akioni2@gmail.com>

CHANGELOG.en-US.md

@@ -2,7 +2,11 @@
 
 ## NEXT_VERSION
 
-`NEXT_VERSION`
+`xxxx-xx-xx`
+
+### Fixes
+
+- Fix `n-input-number` Exception when the value is a string in precision mode, closes [#6091](https://github.com/tusen-ai/naive-ui/issues/6091).
 
 ### Features
 

CHANGELOG.zh-CN.md

@@ -2,12 +2,17 @@
 
 ## NEXT_VERSION
 
-`NEXT_VERSION`
+`xxxx-xx-xx`
+
+### Fixes
+
+- 修复 `n-input-number` precision 模式下 value 为字符串时的异常问题，关闭 [#6091](https://github.com/tusen-ai/naive-ui/issues/6091)
 
 ### Features
 
 - `n-input-number` 新增 `round` 属性，关闭 [#6097](https://github.com/tusen-ai/naive-ui/issues/6097)
 
+
 ## 2.38.2
 
 `2024-05-03`

src/input-number/src/utils.ts

@@ -34,7 +34,7 @@ export function format (
   value: number | undefined | null,
   precision: number | undefined
 ): string {
-  if (value === undefined || value === null) return ''
+  if (typeof value !== 'number') return ''
   return precision === undefined ? String(value) : value.toFixed(precision)
 }