`rdiff` performs a diff of two provided strings or files. As part of its reading
code it uses the return value of a `Read` instance to set the length of
its internal character vector.

If the `Read` implementation claims that it has read more bytes than the length
of the provided buffer, the length of the vector will be set to longer than its
capacity. This causes `rdiff` APIs to return uninitialized memory in its API
methods.Read More