function equal( actual, expected, msg ) {
	/* eslint-disable no-invalid-this */
	this._assert( actual === expected, {
		'message': msg || 'should be equal',
		'operator': 'equal',
		'expected': expected,
		'actual': actual
	});
}
Asserts that `actual` is strictly equal to `expected`.

@private
@param {*} actual - actual value
@param {*} expected - expected value
@param {string} [msg] - message