nl_tokens: Merge cacheControl with defaults
pl_tokens: function mergeCacheControl ( cacheControl , defaultCacheControl ) { if ( cacheControl == null ) { return Object . assign ( { } , defaultCacheControl ) ; } return { maxAge : 'maxAge' in cacheControl ? cacheControl . maxAge : defaultCacheControl . maxAge , staleIfError : 'staleIfError' <mask> cacheControl ? cacheControl . staleIfError : defaultCacheControl . staleIfError } ; }