A sidecar index for OpenOptions: the index itself (an open one stays the caller's to close), its file as a source, or a function that finds it on first use and resolves to undefined when there is none.
OpenOptions
A sidecar index for
OpenOptions: the index itself (an open one stays the caller's to close), its file as a source, or a function that finds it on first use and resolves to undefined when there is none.