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, 'strict' ) ) {
		opts.strict = options.strict;
		if ( !isBoolean( opts.strict ) ) {
			return new TypeError( format( 'invalid option. `%s` option must be a boolean. Option: `%s`.', 'strict', opts.strict ) );
		}
	}
	if ( hasOwnProp( options, 'cache' ) ) {
		opts.cache = options.cache;
		if ( !isMethodIn( opts.cache, 'get' ) ) {
			return new TypeError( format( 'invalid option. `%s` option is missing a `%s` method. Option: `%s`.', 'cache', 'get', opts.cache ) );
		}
	}
	return null;
}
Validates function options.

@private
@param {Object} opts - destination object
@param {Options} options - function options
@param {boolean} [options.strict] - boolean indicating whether to enforce strict bounds checking
@param {Function} [options.cache] - cache for resolving array index objects
@returns {(Error|null)} null or an error object

@example
var opts = {};
var options = {
    'strict': false
};
var err = validate( opts, options );
if ( err ) {
    throw err;
}