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features/binary_formats/ubjson.md
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@@ -69,6 +69,13 @@ The library uses the following mapping from JSON values types to UBJSON types ac
Note that `use_size = true` alone may result in larger representations - the benefit of this parameter is that the
receiving side is immediately informed on the number of elements of the container.
An array whose type marker is `Z` (null), `T` (true) or `F` (false) stores no payload at all, because the marker
already is the value. Its declared count is therefore the only thing that decides how much memory the receiving side
allocates, and a handful of bytes can describe billions of elements. `from_ubjson` rejects such an array with
[`out_of_range.408`](../../home/exceptions.md#jsonexceptionout_of_range408) when the count exceeds 1,048,576
(`1 << 20`), and `to_ubjson` writes longer arrays of these types without the annotation, so any value it produces
can be read back.
!!! info "Binary values"
If the JSON data contains the binary type, the value stored is a list of integers, as suggested by the UBJSON