Wraps a value with a CBOR tag number, or marks one of the non-numeric tag-like shapes (:bytes, :float, :simple) the encoder/decoder treat specially.

Examples

# Raw byte string (CBOR major type 2):
CBOR.encode(%CBOR.Tag{tag: :bytes, value: <<1, 2, 3>>})

# IEEE 754 special floats — Elixir has no native representation:
CBOR.encode(%CBOR.Tag{tag: :float, value: :inf})
CBOR.encode(%CBOR.Tag{tag: :float, value: :"-inf"})
CBOR.encode(%CBOR.Tag{tag: :float, value: :nan})

# CBOR simple value:
CBOR.encode(%CBOR.Tag{tag: :simple, value: 16})

# Arbitrary CBOR tag number (RFC 8949 §3.4):
CBOR.encode(%CBOR.Tag{tag: 1234, value: "payload"})

The decoder produces this struct for CBOR values that don't have a built-in Elixir representation — unrecognized tags, simple values, ±infinity, and NaN.