chaokunyang opened a new issue, #3203:
URL: https://github.com/apache/fory/issues/3203
### Feature Request
update global header for type def, reserve 4 bits in type meta header for
future extensibility
### Is your feature request related to a problem? Please describe
this is current Global header spec:
```text
The 8-byte header is a little-endian uint64:
- Low 12 bits: meta size (number of bytes in the TypeDef body).
- If meta size >= 0xFFF, the low 12 bits are set to 0xFFF and an extra
`varuint32(meta_size - 0xFFF)` follows immediately after the header.
- Bit 12: `HAS_FIELDS_META` (1 = fields metadata present).
- Bit 13: `COMPRESS_META` (1 = body is compressed; decompress before
parsing).
- High 50 bits: hash of the TypeDef body.
```
We don't have reserved bits, it's not easy to change protocol without
breaking binary compatibiity
### Describe the solution you'd like
change it to use `Low 12 bits` to `Low 8 bits`, and use bit 8 for
`HAS_FIELDS_META`, bit `9` for `COMPRESS_META`, and bit 10~13 reserved for
futhre extension, and update xlang_serialization_spec.md and java native
implementation and all language implementations to respect this.
### Describe alternatives you've considered
_No response_
### Additional context
_No response_
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