GraphBinary and Graphson version 4.0 specifications?

Where is the description of the GraphBinary and Graphson version 4.0 formats?
I looked at https://tinkerpop.apache.org/docs/3.4.1/dev/io/, although it covers up to GraphBinary 1.0 and Graphson 3.0.
Is there another place with their description?
Solution
that's a really old link and refers to the 3.4.1 release. i imagine it very out of date. you can replace that version number with any you like. so the most current would be like: https://tinkerpop.apache.org/docs/3.7.3/dev/io/
but you can always just specify "current" and the version to get the most recent one:
https://tinkerpop.apache.org/docs/current/dev/io/
"current" only covers full official releases. upcoming releases get SNAPSHOT publication occasionally: https://tinkerpop.apache.org/docs/4.0.0-SNAPSHOT/dev/io/
though the most up to date for the future will be in github: https://github.com/apache/tinkerpop/tree/master/docs/src/dev/io
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