[1] [CITE@en[flatbuffers/rust/flexbuffers at master · google/flatbuffers · GitHub]], [TIME[2021-10-05T11:49:46.000Z]] <https://github.com/google/flatbuffers/tree/master/rust/flexbuffers>

>Flexbuffers is a schema-less binary format developed at Google. FlexBuffers can be accessed without parsing, copying, or allocation. This is a huge win for efficiency, memory friendly-ness, and allows for unique use cases such as mmap-ing large amounts of free-form data.

>Flexbuffers is the schema-less cousin of Flatbuffers.

[2] [CITE[FlatBuffers: FlexBuffers]], [TIME[2021-08-05T19:14:22.000Z]], [TIME[2021-10-05T11:50:45.753Z]] <https://google.github.io/flatbuffers/flexbuffers.html>