AcDbDxfValueType:
    | "string"
    | "int"
    | "long"
    | "double"
    | "bool"
    | "handle"
    | "binary"

Maps a DXF group code to the value type it carries.

Constant across DXF versions (AC1009 → AC1032+). Reference: AutoCAD DXF Reference "Group Codes in Numerical Order"; ezdxf lldxf/types.py.