Opaque DXN custom tag (@tag value), produced when no decoder is
registered for its name — the open extension point DXN.md §1.2
reserves for any tag name that isn't one of the built-ins (@uuid,
@duration, ...). Prefer a schema-backed struct over a custom tag
for anything with real field structure; reserve custom tags for
simple scalar-wrapping. Mirrors Dextrin.CustomTag exactly. No
conversion helper: an open extension point has no fixed native
shape to convert to/from.
Opaque DXN custom tag (
@tag value), produced when no decoder is registered for its name — the open extension pointDXN.md§1.2 reserves for any tag name that isn't one of the built-ins (@uuid,@duration, ...). Prefer a schema-backedstructover a custom tag for anything with real field structure; reserve custom tags for simple scalar-wrapping. MirrorsDextrin.CustomTagexactly. No conversion helper: an open extension point has no fixed native shape to convert to/from.