function decapitalize(subject) {
    var subjectString = coerceToString(subject);

    if (subjectString === '') {
      return '';
    }

    return subjectString.substr(0, 1).toLowerCase() + subjectString.substr(1);
  }
Converts the first character of `subject` to lower case.

@function decapitalize
@static
@since 1.0.0
@memberOf Case
@param  {string} [subject=''] The string to decapitalize.
@return {string}              Returns the decapitalized string.
@example
v.decapitalize('Sun');
// => 'sun'

v.decapitalize('moon');
// => 'moon'