Preview of the proposed up-rust native-frame-model branch (up-rust b6b99c6d, up-spec f0e9b17) — not released documentation. branch · write-up
up_rust::wire

Constant LOCAL_EXPERIMENTAL_COMPACT_ID_END

Source 
pub const LOCAL_EXPERIMENTAL_COMPACT_ID_END: u16 = 0xFFFE;
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Last compact ID reserved for local or experimental future tools.