RLMeshBytes
An owned buffer produced by the capi (its cap lets the capi reclaim the allocation). Free with rlmesh_bytes_free. An EMPTY buffer is normalized to {NULL, 0, 0} — data is never a non-NULL zero-length pointer, so a consumer may branch on data as well as on len — and rlmesh_bytes_free accepts that form.
struct RLMeshBytes