Binary constants for the BTOON wire format.

BTOON is the binary transport encoding of the TOON data model (see Btoon). This module defines the byte-level constants: the envelope magic/version, flag bits, value type tags and typed-array / schema element type selectors.

Envelope

+------------------+
| Magic "BTON"     |  4 bytes
+------------------+
| Version          |  1 byte
+------------------+
| Flags            |  1 byte
+------------------+
| Reserved         |  2 bytes (MUST be zero)
+------------------+
| String Table     |  variable, zero-padded to a multiple of 8 bytes
+------------------+
| Schema           |  variable (only when the schema flag is set)
+------------------+
| Body             |  variable, 8-byte aligned
+------------------+

Flags

bit0 (0x01) reserved
bit1 (0x02) schema included
bit2 (0x04) string table present
bit3 (0x08) session dictionary active
bit4 (0x10) no per-message string table
bit5 (0x20) schema ID is UInt16
bits6-7      reserved