# Functions
CountingLinkSystem wraps an ipld linksystem with to track the size of data loaded in a `counter` object.
TeeingLinkSystem wraps an IPLD.LinkSystem so that each time a block is loaded from it, that block is also written as a CAR block to the provided io.Writer.
# Interfaces
An IndexTracker tracks the records loaded/written, calculate an index based on them.
ReadCounter provides an externally consumable interface to the additional data tracked about the linksystem.