An opaque handle to something that can be parsed, obtained from ConfigIncludeContext.
Do not implement this interface; it should only be implemented by the config library. Arbitrary implementations will not work because the library internals assume a specific concrete implementation. Also, this interface is likely to grow new methods over time, so third-party implementations will break.
Get the initial options, which can be modified then passed to parse(). These options will have the right description, includer, and other parameters already set up.
Get the initial options, which can be modified then passed to parse(). These options will have the right description, includer, and other parameters already set up.