Create a chain of 2 arguments.
Create a chain of 2 arguments. This is implemented as a chain on the single argument consisting of the pair of the two arguments. If both arguments are cachable, a CachingChain will be produced, otherwise a NonCaching chain.
Create a chain of 1 argument.
Create a chain of 1 argument. The Chain factory constructor chooses either a CachingChain or NonCachingChain depending on the cacheability of the parent. The parent's cacheability is determined by the parent.isCachable field. This is normally determined by the type of the element.