What Pros & Cons would there be to saving code more granularly at the file level?

~/proj/MyClass.ext
~/proj/MyClass:constructors.ext
~/proj/MyClass:properties.ext
~/proj/MyClass:method-one.ext
~/proj/MyClass:method-two:int.ext
~/proj/MyClass:method-two:string.ext

~/proj/definitions.ext
~/proj/function-one.ext
~/proj/function-two:int.ext
~/proj/function-two:string.ext
...