G-code Preview — API Reference
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        | "bytes"
        | "segments"
        | "objects"
        | "components"
        | "placements"
        | "meshes"
        | "chunks"

    The typed unit a stage's {done,total} counts (DD-024 §4 D2) — a machine enum, never a display label. 'meshes'/'chunks' on preparing-scene count GPU submissions, not measured upload completion.