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J. Nick Koston
ba362a7c95
Per Copilot review: encode_varint_raw_48bit and calc_uint64_48bit_force would silently truncate bits 48..63 if ever called with a uint64 that doesn't fit in 48 bits. Real MAC addresses always fit, but since the helpers are exposed and the (mac_address) option is generic, narrow the fast path to [1<<42, 1<<48) so values outside that range fall back to the general encoder/size helpers. Re-verified byte-identical output and decoder round-trip across the 1<<48 boundary and all bit positions up to 63.
