function validate( opts, options ) {
	if ( !isObject( options ) ) {
		return new TypeError( format( 'invalid argument. Options argument must be an object. Value: `%s`.', options ) );
	}
	if ( hasOwnProp( options, 'skip' ) ) {
		opts.skip = options.skip;
		if ( !isBoolean( opts.skip ) ) {
			return new TypeError( format( 'invalid option. `%s` option must be a boolean. Option: `%s`.', 'skip', opts.skip ) );
		}
	}
	if ( hasOwnProp( options, 'iterations' ) ) {
		opts.iterations = options.iterations;
		if (
			!isPositiveInteger( opts.iterations ) &&
			!isNull( opts.iterations )
		) {
			return new TypeError( format( 'invalid option. `%s` option must be either a positive integer or null. Option: `%s`.', 'iterations', opts.iterations ) );
		}
	}
	if ( hasOwnProp( options, 'repeats' ) ) {
		opts.repeats = options.repeats;
		if ( !isPositiveInteger( opts.repeats ) ) {
			return new TypeError( format( 'invalid option. `%s` option must be a positive integer. Option: `%s`.', 'repeats', opts.repeats ) );
		}
	}
	if ( hasOwnProp( options, 'timeout' ) ) {
		opts.timeout = options.timeout;
		if ( !isPositiveInteger( opts.timeout ) ) {
			return new TypeError( format( 'invalid option. `%s` option must be a positive integer. Option: `%s`.', 'timeout', opts.timeout ) );
		}
	}
	return null;
}
Validates function options.

@private
@param {Object} opts - destination object
@param {Options} options - function options
@param {boolean} [options.skip] - boolean indicating whether to skip a benchmark
@param {(PositiveInteger|null)} [options.iterations] - number of iterations
@param {PositiveInteger} [options.repeats] - number of repeats
@param {PositiveInteger} [options.timeout] - number of milliseconds before a benchmark automatically fails
@returns {(Error|null)} error object or null

@example
var opts = {};
var options = {
    'skip': false,
    'iterations': 1e6,
    'repeats': 3,
    'timeout': 10000
};

var err = validate( opts, options );
if ( err ) {
   throw err;
}