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features/binary_formats/bjdata.md
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@@ -116,9 +116,19 @@ The library uses the following mapping from JSON values types to BJData types ac
```
Likewise, when a JSON object in the above form is serialized using
[`to_bjdata`](../../api/basic_json/to_bjdata.md), it is automatically converted into a compact BJData ND-array. The
only exception is, that when the 1-dimensional vector stored in `"_ArraySize_"` contains a single integer or two
integers with one being 1, a regular 1-D optimized array is generated.
[`to_bjdata`](../../api/basic_json/to_bjdata.md), it is automatically converted into a compact BJData ND-array. When
the 1-dimensional vector stored in `"_ArraySize_"` contains a single integer or two integers with one being 1, a
regular 1-D optimized array is generated instead.
An object is only converted if the annotation actually describes a packed array; otherwise it is serialized as a
regular JSON object. This requires all of the following:
- `"_ArrayType_"` is one of `uint8`, `int8`, `uint16`, `int16`, `uint32`, `int32`, `uint64`, `int64`, `single`,
`double`, `char`, or `byte`,
- every entry of `"_ArraySize_"` is a non-negative integer, and their product is representable as a `std::size_t`,
- `"_ArrayData_"` holds exactly that many elements, and
- every element of `"_ArrayData_"` is a number of the kind named by `"_ArrayType_"` (a floating-point number for
`single` and `double`, an integer otherwise).
The current version of this library does not yet support automatic detection of and conversion from a nested JSON
array input to a BJData ND-array.