"Child"/"Children" words are lowercased on singularize/pluralize.

```javascript
pluralize('car') // => cars
pluralize('Car') // => Cars
singularize('cars') // => car
singularize('Cars') // => Car

// So far, so good...

pluralize('child') // => children
pluralize('Child') // => children # why lowercased?
singularize('children') // => child
singularize('Children') // => child # why lowercased?
```

Using version 2.0.1.

Start by reproducing the pluralize('Child') and singularize('Children') examples from the issue, then locate the capitalization handling for the pluralize and singularize entry points. Done means preserving the initial capital for these irregular forms while retaining the existing lowercase behavior, with regression coverage for the shown cases.

Written by the indexing model from the issue text.