I'm also clarifying that while elements are not deduplicated, vectors
may contain more than one offset to the same value.
Signed-off-by: Juan Cruz Viotti <jv@jviotti.com>
This is an attempt to explain how FlatBuffers encodes union types as an
extra section in the "FlatBuffers internals" document.
Signed-off-by: Juan Cruz Viotti <jv@jviotti.com>