Variable HONUA_GEOARROW_ENVELOPE_VERSIONConst Experimental

HONUA_GEOARROW_ENVELOPE_VERSION: "1.1" = ...

Envelope layout version written today.

1.1 adds the decoded byteLength of every backing and stamps the GeoArrow layout version, so backing ceilings are enforced before base64 is decoded rather than after a caller-sized allocation already happened.