Represents a generic item with a string key value
Example:
```ts
const lst: IKeyValuec<string> = {
src: 'https://someUrl.come/js/myjs.js',
scrolling: 'yes',
type: 'text/javascript'
};
for (const key in lst) {
if (lst.hasOwnProperty(key)) {
const value = lst[key];
console.log(key, value);
}
}
console.log('src: ', lst['src']);
console.log('type: ', lst.type);
```
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