DXN uuid (@uuid "...", RFC 4122). Wraps 16 raw bytes, not the
36-char text form — the text form exists only at the .dxn/.dxnb
encoding boundary (parse/1/format/1 below convert between them);
the in-memory value stays the compact, comparison-cheap byte form.
Summary
Functions
Renders the canonical 36-char hyphenated text form.
Parses the canonical 36-char hyphenated text form.