clone method

[blond]

const BemEntityName = require('@bem/entity-name');

const buttonName = new BemEntityName({ block: 'button' });

buttonName.clone(); // BemEntityName({ block: 'button' })

const mutant = buttonName.clone({ elem: 'text' }); // BemEntityName({ block: 'button', elem: 'text' })

mutant.clone({ elem: null }); // BemEntityName({ block: 'button' })

[blond]

Simple clone without parameters looks strange for immutable objects. Especially if we to implement optimization for create same instances (#103).

const BemEntityName = require('@bem/entity-name');

const name = new BemEntityName({ block: 'button' });
const clone = buttonName.clone();

name === clone // WTF ???