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2026-07-31 06:34:27 +00:00
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features/binary_formats/bson/index.html
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features/binary_formats/bson/index.md
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@@ -31,6 +31,14 @@ Incomplete mapping
The mapping is **incomplete**, since only JSON-objects (and things contained therein) can be serialized to BSON. Also, keys may not contain U+0000, since they are serialized a zero-terminated c-strings.
BSON type 0x11 interoperability
The BSON specification defines type `0x11` as a Timestamp. This library uses marker `0x11` when serializing `number_unsigned` values in the range `9223372036854775808..18446744073709551615`. Other BSON implementations may therefore interpret these values as Timestamps instead of unsigned integers.
Binary values without a subtype
BSON requires every binary value to have a subtype. If a binary value has no subtype, this library serializes it with the generic subtype `0x00`. After deserialization, `has_subtype()` returns `true` and `subtype()` returns `0`. As a result, serializing and deserializing a JSON object containing such a value produces a different JSON object, even though the binary data is unchanged.
Example
```
@@ -98,7 +106,7 @@ The mapping is **incomplete**. The unsupported mappings are indicated in the tab
Handling of BSON type 0x11
BSON type 0x11 is used to represent uint64 numbers. This library treats these values purely as uint64 numbers and does not parse them into date-related formats.
This library deserializes BSON type `0x11` (Timestamp) as a `number_unsigned` value. The 64-bit value is preserved, but the Timestamp type information is not.
Example